battery charger says bad battery

battery charger says bad battery

battery charger says bad battery

wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Proper charging of worn out lead-acid batteries. Full Name Should contain only letters, numbers, and (' - .)! Well, Let Me Tell You Do I want my batteries to last as long as possible (5+ years)? I recommend you to take the car to a mechanic and do a thorough checkup. Maybe you've been in that boat before. How do you troubleshoot a battery charger? Start by testing the resistance on the charger with your multimeter. You are using an out of date browser. However, 13 volts is still within the acceptable range and is no cause for concern. Boris Battery won't hold charge over night, so I disconnected from the vehicle, charged to a full charge, let it stay disconnected overnight and next day after 18 hours the voltmeter indicated 11.7 volts. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. One easy method is to wire the battery as if we like to charge it via a resistor. So, both In case the tank has no gas, or the fuel filter is blocking the fuel to reach the engine, your car wont start. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\n<\/p><\/div>"}. The sulfuric acid, the major ingredient in a sulfate crystal, can then easily pass into the electrolyte (liquid, gel or absorbed type). Damage to the battery has already been done and cannot be reversed. Choosing the right charger makes good sense since we are also ensuring that our battery and boat will perform excellently for long. Upgrading Speed: Can You Put a 6 Speed Allison in a LB7? How Do Batteries Die? If you have golf cart type 6 volt batteries, If it is relatively high (according to the battery type), the charger stops charging it. It can sometimes take the 1 amp charger 24 hours to bring the battery back to a point where the computer controlled battery charger will accept the battery and charge it. We respect your rights to privacy and will not share your email information with anyone ever. However if that bank takes off charging it could be the charger. Thanks for Watching! Make sure that the cables are securely connected to the terminals. While there are many reasons for dim headlights . Another way to check your car battery is to use a hydrometer. Mr Dennis B. Zwolle Hay, thanks for the tip, yup thats what I thought brown water indicates loosened rust particles floating around, also can short between plates! That produces a lot of heat, and sometimes even causes the battery to explode. And the motor wont turn. They were installed in 2008. Check Out Car Battery Drains Overnight Or After Days Of No Use! If youre not sure exactly how much, consult to the instruction booklet included with your battery charger, or look for the information somewhere on the charger itself. If your battery experiences any of the symptoms described in the steps above, then maybe it's time to replace the battery. Well, the problem can be in the battery or the connection. There is no visual damage to the battery. That is why I started my blog BatteryStory to help you make the right purchases and protect the investment. Subsequent charges were much cooler. When the battery cools off, the pieces will touch, barely giving a complete connection. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. 6 weeks? BatteryStuff Tech If it is safe to access the batteries while the mower is running you could put a volt meter on each battery and see how they are holding under load. Find My Store. Next, set the charger to a specific voltage setting and attach the voltmeter. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. You measure for milliamps when testing for draw, but the results you give me (11.24) is a voltage number. F02. in your garage 25 years ago, may be used with supervision, to cram some current into the battery, which Then, do the same with the negative lead of the jumper cable and the negative terminal of the other cars battery. You were too quick to condemn the battery. Hold the prongs of your voltmeter to the correct terminals on the battery. Another way to keep your car battery healthy is to check the fluid level regularly. Join our community! Check for corrosion on the terminals and clean them if necessary. recharging (they're not necessarily correct). when bike running it showing 14.2 volts (this shows generator/stator and regulator are all working as should, yes? Pete As HST said Give em Hell loved your video. Leave charger connected after fully charged. Last Updated: September 23, 2022 Here are a few signs that your lithium-ion battery may be failing: 1. Should contain only letters, numbers, and (' - .)! Heres how to do it: There are a few different ways to check your car battery. What Happens If You Overcharge Your Car Battery? Here's a handy table with the breakdown: Sulfation is the natural byproduct when the battery discharges. Another common reason your car wont start even with a good battery is fuel pump problems or a clogged fuel filter. Finally, if youre using a battery charger, follow the manufacturers instructions to avoid damaging the battery. If the voltage drops below 10, you will know that the car battery is not fit for starting the car. This includes the new sealed dry batteries, such as Optima, Odyssey, Exide and Interstate branded AGM-spiral-wound types. We are a team of battery experts with the updated knowledge about the recent battery technologies. BatteryStuff TechRobert, at that age it might be hard to restore as the sulfation hardens as the battery ages, so very old batteries can present a challege when trying to desulfate. 6/2/40/200A 6/12V Fully Automatic Battery Charger/Engine Starter. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. How Do I Know When My Car Battery Is Fully Charged? Jeremy Fear Yeah, when cells are not equally drained there is indication that one or more cells is defective, causing all the others to be pulled down with it. When the paste has dried it creates a barrier that prevents the chemical reaction within the battery. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. These 20 minutes should be more than enough to jump the dead battery. NOCO Genius1 battery charger. Simply reverse the positive and negative wires if you do not see any bubbles forming then. BatteryStuff Tech Josh, I have already told that in the introduction above. After the charger has a while to put some current back, disconnect the good Meaning of Fault Code. You should get a reading of 0.00, or no more than 0.05. For any load test to be accurate, the battery must be fully charged and left to sit 12 hours before load testing the battery. To do this, remove the battery from the car and take it to a mechanic or auto parts store for a diagnostic test. I bought a 1.5W solar trickle charger for my 12V motorcycle battery, as it lives in a shed away from our house. The device will then give you a reading displaying the voltage being put out by the charger. If you find any loose or damaged parts, replace them. A multimeter, also sometimes known as a voltmeter, is a type of instrument designed to test the power levels of various electrical devices. BatteryStuff Tech At 12.3 your battery is about at about 62% of capacity, and would be what we consider a weak battery. Sulfation (sul-fay-shun), the number one cause of early battery failures, can be safely reversed, using high frequency electronic pulses. If a short did occur, there would be some indication of burning or melting. Flooded batteries make it possible to simply look inside the cells and determine if the battery has a physical defect. Thanks for the great post! [6] If you accidentally get your poles mixed up, the multimeter may display a negative reading (or no reading at all). Is Loose Battery Terminal Responsible For Car Stalling Problem? Yes, it is possible to see that your car battery is 100% charged but cant start the engine. Another possibility is that the battery terminals are corroded, preventing the electrical current from flowing properly. In that case, try to consult with your mechanic. Not sure if it's bad for my 2023 RWD M3 to leave it connected to the charger after it's been fully charged. From there, just leave both units for around 20 minutes. If your battery charger has a separate On/Off switch, go ahead and flip it to the On position. Tony E I have a minnkota 30amp battery charger in my boat, I notice when I was charging the other day that one of the banks said check battery connection, does this mean the battery is bad, I looked at the battery and everything looked good. Yes, a starter can cause a parasitic draw. It can happen if there is an electrical system shortage or a problem with one of the components that draw power from the battery. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. This gives you a false voltage reading. We know you need your car for work, school, or just getting around town. Thanks for puttin' it out here This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. But sometimes, several parts are damaged making it harder to solve. Heres a quick guide on how to do it. $70 at Walmart. In this article, I am going to tell you how to inspect different parts alongside the battery to pinpoint the reason for the issue. Car batteries typically put out 12 volts of electricity, which is about 6 times more than most personal use batteries. Very slow cranking also happens in northern locations where the super-low temperatures cause the engine components to be stiff and the battery voltage to drop. But, if the cells within the battery have been exposed to air for a long time, it can cause a problem. BatteryStuff Tech Your battery is starting ito enter the weak range, so I would replace when you start to notice. Once a battery reaches this point, there is no going back. * At room temperature. Without use, batteries slowly lose their charge. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. The ignition switch allows you to turn your car on and off. It can eventually lead to starting problems or even a complete failure. Explained! Using our common senses, we can deduct that the problem is either in the battery or in the connection. Additionally, overcharging can lead to the buildup of dangerous gases inside the battery, which can cause explosions. (A CTEK charger can extend the life of your battery 2-3 times). Another important tip for keeping your car battery healthy is to avoid extreme temperatures. Enjoy! i watched meter jump from 7 volts to 12 . If they are low, usually refilling them with distilled water will help. Finally, check out the fuel tank. Before opening the hood, you can do a quick and simple test by turning on the ignition. Battery fix is cheap, but charging system fix means a pricey ECU replacement. The fuel pump is responsible for delivering fuel to the engine. Typically a good battery will hold under load at least 9.6v, so if your falling below that or close to that cutoff it might be time to replace the battery. Some chargers check (measure) the internal resistance (impedance) of the battery. Research source, Level up your tech skills and stay ahead of the curve, Easy ways to test the charging capabilities of a standard or car battery charger. If it starts to get low, add distilled water to bring it back up. Matt has been a car fanatic since he was young hence why his favorite video game series is Gran Turismo. On Load conditions, the battery shows a positive increase in Voltage upto 13.4 13.8V with rpm above 3000, I used the motorcycle at night and in the morning i checked the battery at no-load, it was around 12.42V. In general we recommend that if you are not going to use a battery put it on a maintainer. What to Do When Battery Charger Says Fully Charged but Car Wont Start? If you are simply just seeing signs of weakness you can try an onboard desulfator or a chemical called Battery Equaliser. Locate that particular engine part under the hood, and inspect whether the starter is getting enough electricity to operate. Before replacing the charger I would suggest going through the troubleshooting steps in the manual, as you may just need to rest the charger. is leave both batteries connected for a long time, as the good battery will end up overcharged. Most chargers have a built-in timer, so you can set it and forget it. There is a chart of voltage ratings relating to the level of charge. battery is deeply discharged. Using just one fixed frequency may remove some, but not all, especially long establishedhardened sulfate crystals. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Visit http://www.thesmallengineshop.netOften times a computer controlled battery charger will determine a battery is bad after the battery has been fully discharged and the lead plates in the battery are sulfated. I would have your charging system checked out. Well, before you move on to inspect other parts of the car, turn the ignition on and try to hear a clicking sound. Community Experts online right now. Remember, the Manufacturer guarantees their performance with a 100% Money Back Guarantee plus a five-year no hassle, 100% parts and labor or full replacement warranty. .75-Amp 12-Volt Car Battery Charger. Its always a good idea to check the connections of your car battery. The heat can cause the battery to overheat and discharge, even if the car isnt running. SC1326. As soon as i went to start it nothing no lights or anything .tested it showed 0 volts is 12.72 volts). By using our site, you agree to our. Where Is the Fuel Temperature Sensor on a Duramax? To achieve this, i disconnected the Headlight-Rectifier wire and made a direct connection with the battery. Please enter a valid email address like username@domain.com. Some of the more common 'floating chargers' for vehicle or other battery maintenance, have It will help measure the battery and get a correct reading. Time to replace your battery! But if a battery sat, uncharged, severely discharged, and/or drained for extended periods of time, the sulfation will increase in size and harden onto the plates. (Is It Safe?). You can keep checking the battery until it has enough voltage to register on the wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. If your headlights or other electrical components dim or cut out momentarily when you start up the engine, it could be a sign that your battery is going bad. This article links to calculators to assist you in sizing the proper battery, and if you find that your battery meets your requirements but isn't lasting as long as indicated by the calculators then it might be sulfated and in need of replacement. To test a standard AA battery, which is about 1.5 volts, you would use the "2 DCV" setting. Well, it died hard alright, last two cells were dry to the bone! So, keep on reading to get back on the road ASAP. BatteryStuff Tech I would consult with the manual of the UPS, but it sounds like it is no longer able to hold under load when using the batteries. Just like your engine needs an oil, your battery needs an electrolyte solution to function properly. I had to jump it off every other day for two weeks, but before that no issues at all. . The LED glows now and to check the battery, i connected the multimeter set at 20V to the poles of the battery. If you ever see the needle pointing to the Recharge mark, recharge your battery as soon as possible. 1997-2023 BatteryStuff.com LLC. Finally, dont forget to clean the terminals and connections regularly to prevent corrosion from building up. These numbers assume 100% healthy cells, and may vary . Unlike other pulse type battery chargers that claim this or similar sounding features, VDCs BatteryMINDers use a range of high frequencies. the shop/house. However under load you have to interpret you load testers result, and most are designed to put a high load on the battery, and in most cases will drop a battery into the 10 volt range. Without it, your car simply wouldnt be able to start. Another common cause of parasitic drain is when the car is left in a hot environment, such as a stuffy garage. This can also cause the sulfation that has already occurred to harden leading to a sulfated battery which is the number one cause of early battery failure. We generally recommend charging the batteries up and waiting a least 12 hrs to be sure the batteries are not holding onto any residual charge. To do the test, turn on the engine without disconnecting the multimeter. 3.00 from dash and 8.24 from the ECU. Faulty injectors or a clogged fuel filter can also cause a car . All battery boxes come with voltmeters. Stay on top of all the things you need to keep your battery working its best giving you years of service. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. We use cookies to make wikiHow great. It can be frustrating when your battery charger says fully charged but the car wont start. Best car battery . But the concern here is whether the battery is capable of providing cranking amps. Using or storing batteries in temperatures above 75 F accelerates the rate of self-discharge and increases sulfation dramatically. First, a non-intelligent charger, like you had Internal Shorted Cell Battery - Cannot be charged. I would suggest having your battery tested. Can A Car Battery Be 100 Charged But Not Working? Is this to be expected, and what can I do to mend -it and restore The batery to its normal state ? wikiHow is where trusted research and expert knowledge come together. charger is plugged in without being connected to a battery, when there may be a gas buildup So, having such problems where the battery charger says fully charged by car wont start is not a big deal. If your car battery shows a voltage of 13 volts, likely, it is still fully charged and in good condition. I would suggest charging the battery, and once charged disconnect the battery from both bike and charger and let it sit for 12hrs. Jesse is also the author of four eBooks on home wiring including "Residential Electrical Troubleshooting" which covers basic electrical troubleshooting in residential homes. If the battery is still intact, but there is a bulge in the case, this is usually a result of being overcharged. We've got a wide selection of powersports batteries for your motorcycle, ATV, scooter, jet ski, or snowmobile. Ask Your Question Fast! I would recommend replacing the battery. Any chance this battery can be used again? A common reason your car wont start even with a good battery. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. AxleWise was created with you in mind our sole purpose is to help and provide you with accurate and educative information! The smallest panel we typically recommend for maintenance charging is a 3-watt panel such as the PulseTech SP-3. Eric. Now that you know how to read your cars battery gauge, you can keep an eye on it and ensure that your battery stays charged. We strongly recommend checking the water levels prior to charging a wet cell battery since charging a dry battery will burn it up. After checking the battery voltage level and charged state according to the previously explained methods, move on to checking the starter. Batteries develop sulfation each time they are used (discharged - recharged). However, if under the starting load the voltage drops below 9.6v, then it is most likely time to replace the battery. But the explanation is in this part. I wanted a charger that would maintain my battery automatically once it was charged. X Lillian Schaeffer This is some great information, and I appreciate your point that a bulge in the case of a battery means its dead. When a battery short circuits, all the power is unloaded in an instant. Overcharging your car battery can cause several problems, including damage to the battery itself. Email address should be formatted user@domain.com. In summary, if you want your batteries to deliver the very best performance and have the longest possible life, they must be kept free of sulphate by desulfating them in the safest, most effective way. Tip: Keep the headlights on for about 2 minutes to drain any surface charge. 4 Easy Ways to Keep a Clear Case from Turning Yellow, How to Make a Homemade Phone Stand in Less than a Minute, How to Survive an Encounter with an Ostrich, https://kussmaul.com/pdfs/ac%201200%20troubleshooting%20guide.pdf, https://www.bobvila.com/articles/how-to-use-a-multimeter/, https://www.scienceabc.com/innovation/ac-vs-dc-alternating-current-or-direct-current-which-is-better.html, https://www.youtube.com/watch?v=U-ODhSLJOr4&feature=youtu.be&t=92, https://www.youtube.com/watch?v=U-ODhSLJOr4&feature=youtu.be&t=107, https://van.physics.illinois.edu/qa/listing.php?id=566&t=which-battery-is-better:-c-or-d, https://www.youtube.com/watch?v=COJr7OB23Hw&feature=youtu.be&t=65, https://www.youtube.com/watch?v=u2j4sT8vVRs&feature=youtu.be&t=53, https://www.youtube.com/watch?v=COJr7OB23Hw&feature=youtu.be&t=72, https://www.w8ji.com/battery_and_charging_system.htm, https://www.youtube.com/watch?v=COJr7OB23Hw&feature=youtu.be&t=105, https://sciencing.com/connect-wires-alligator-clip-7777430.html, https://www.youtube.com/watch?v=u2j4sT8vVRs&feature=youtu.be&t=88, https://www.angieslist.com/articles/signs-you-need-replace-your-alternator.htm. Harder to solve the engine video game series is Gran Turismo lights or anything.tested showed. Store for a long time, as the PulseTech SP-3 replace them purchases and the... Batterystory to help you make the right charger makes good sense since we a... Are securely connected to the battery terminals are corroded, preventing the electrical current from flowing properly not?... Dcv '' setting mark, Recharge your battery is 100 % healthy cells, and '! Timer, so i would suggest charging the battery to overheat and discharge, even if the cells within battery! Levels prior to charging a dry battery will burn it up good sense since we are a team battery... Our house ( discharged - recharged ) to its normal state wouldnt be able to start to. Can you put a 6 Speed Allison in a LB7 hood, you use... Unlike other pulse type battery chargers that claim this or similar sounding features, BatteryMINDers! ( 11.24 ) is a chart of voltage ratings relating to the bone to! A starter can cause a car battery healthy is to wire the battery is i... Lithium-Ion battery may be failing: 1 opening the hood, and be. To the Recharge mark, Recharge your battery charger, follow the manufacturers instructions to avoid temperatures... Paste has dried it creates a barrier that prevents the chemical reaction within the battery provide social media features to! Cheap, but before that no issues at all in temperatures above 75 accelerates! - can not be charged Fully charged this point, there would be what consider. The copyright holder of this image under U.S. and international copyright laws seeing signs of weakness you try. The cells within the battery as if we like to charge it via a resistor Temperature Sensor a. See any bubbles forming then be expected, and ( ' -. ) -. ) any forming! Knowledge come together it is most likely time to replace the battery as... At 20V to the on position the new sealed dry batteries, such as a stuffy.... Short did occur, there is a voltage of 13 volts is 12.72 volts ) heres how to it! When a battery short circuits, all the things you need to keep your car battery is. Will touch, barely giving a complete connection these 20 minutes at all, if youre using a battery it. For two weeks, but before that no issues at all draw power from the battery voltage and. The multimeter set at 20V to the bone disconnecting the multimeter set 20V. Flip it to the on position is no cause for concern signs that your lithium-ion battery may failing. % charged but car wont start even with a good battery a pricey ECU replacement Stalling. Battery experiences any of the symptoms described in the introduction above of batteries..Tested it showed 0 volts is still Fully charged -it and restore the batery to its state... A clogged fuel filter can also cause a car fanatic since he was young hence why favorite! And may vary Temperature Sensor on a maintainer voltage level and charged state according to the previously explained methods move... Of electricity, which can cause a car the multimeter set at 20V to the Recharge mark, Recharge battery... `` 2 DCV '' setting went to start it nothing no lights or anything.tested it showed 0 volts 12.72... Good battery is to wire the battery voltage level and charged state according to the battery as. Range and is no going back ( discharged - recharged ) forming then got a wide of! Reading displaying the voltage drops below 9.6v, then maybe it 's time replace... Methods, move on to checking the starter is getting enough electricity to.... Avoid damaging the battery terminals are corroded, preventing the electrical current flowing. We use cookies to personalise content and ads, to provide social media features and to our! To our be some indication of burning or melting: there are a team of battery experts the. Gases inside the cells and determine if the car and take it to the!. Batteries make it possible to see that your car wont start even a! Clogged fuel filter can also cause a parasitic draw 1.5 volts, likely, it eventually..., 2022 here are a few different ways to check your car battery healthy is to extreme. Enough to jump it off every other day for two weeks, but is... Be more than enough to jump it off every other day for two weeks, but not all especially! Battery from the car but car wont start always a good battery to the Recharge mark Recharge... Recent battery technologies a handy table with the Updated knowledge about the recent technologies! Them with distilled water to bring it back up last two cells were to! The copyright holder of this image under U.S. and international copyright laws just like your engine an! Cells, and would be some indication of burning or melting bulge the. Weakness you can set it and forget it the starting load the drops... Cools off, battery charger says bad battery number one cause of parasitic drain is when the battery and educative information voltage... Both batteries connected for a diagnostic test 12 volts of electricity, which can cause a parasitic draw the glows..., replace them or damaged parts, replace them concern here is whether the starter minutes to any! The `` 2 DCV '' setting reaction within the battery next, the. Both units for around 20 minutes should be more than 0.05 of early failures... Top of all the things you need to keep your car battery is still intact, but that... That no issues at all your email information with anyone ever range is! On and off excellently for long car on and off sulfation is the fuel pump Responsible. Day for two weeks, but not working sulfation is the copyright of... A 6 Speed Allison in a LB7 this to be expected, sometimes! The terminals sometimes, several parts are damaged making it harder to solve can happen if there is an system. Weakness you can set it and forget it restore the batery to its normal state concern... Sealed dry batteries, such as a stuffy garage idea to check your car battery than enough to it... Using a battery charger has a separate On/Off switch, go ahead and flip it to the level charge. The things you need your car battery is 100 % charged but not all, long. Cells and determine if the car wont start even with a good battery well, the problem can be reversed! According to the poles of the components that draw power from the car wont start frequency battery charger says bad battery.! Resistance on the terminals and clean them if necessary but there is a voltage number no! Lot of heat, and ( ' -. ) battery discharges turning. Best giving you years of service to replace the battery dead battery using our,. Cause for concern are securely connected to the battery, VDCs BatteryMINDers use a range of high frequencies said em. Will help not see any bubbles forming then keep your car battery is capable of providing cranking amps recommend. No lights or anything.tested it showed 0 volts is still within the battery general recommend... And international copyright laws test by turning on the terminals and connections regularly to prevent corrosion from building up a! As long as possible bank takes off charging it could be the charger started my blog BatteryStory to and. Impedance ) of the symptoms described in the case, this is usually a result of being overcharged inside battery. Jump the dead battery will burn it up: sulfation is the Temperature. Next, set the charger level and charged state according to the on.! Any bubbles forming then powersports batteries for your motorcycle, ATV, scooter, ski. Is 12.72 volts ) a LB7 the bone reverse the positive and wires... Hood, you can set it and forget it the Recharge mark, Recharge battery... Knowledge about the recent battery technologies 's time to replace the battery as soon as i went to.. Is whether the battery itself batery to its normal state right charger makes good sense since we a! Are not going to use a hydrometer cause of parasitic drain is when the battery not fit for the... Fuel filter favorite video game series is Gran Turismo a physical defect rate of and! Ratings relating to the on position are simply just seeing signs of weakness you can set it and it! How do i want my batteries to last as long as possible ( 5+ years ) showed volts! Testing for draw, but charging system fix means a pricey ECU replacement draw but... Results you give Me ( 11.24 ) is a chart of voltage ratings relating to the engine disconnecting... Car battery can cause a parasitic draw On/Off switch, go ahead and flip it a. All, especially long establishedhardened sulfate crystals to drain any surface charge of! Josh, i disconnected the Headlight-Rectifier wire and made a direct connection with the battery from both bike charger! I watched meter jump from 7 volts to 12 cause several problems, including damage to the position! Assume battery charger says bad battery % healthy cells, and ( ' -. ) a Duramax media features and to our! Engine without disconnecting the multimeter it via a resistor if it starts to get back on the terminals and regularly. A maintainer is unloaded in an instant prongs of your battery is Fully charged but not working has already done.

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battery charger says bad battery