![]() However when a battery is really cold, about 0 Fahrenheit, it won't charge from either the car's alternator or an external charger. An automatic charger with an amp meter may even help predict failure. The industry says the average car battery lasts 3.5 years, but a battery can wear out sooner if it's not charged enough, and infrequent driving or mostly short trips between starts can leave a battery undercharged, in which case hooking it up to a charger every week may add 1-2 years to its life. I don't know many amps your car stereo draws, but it can't be more than the rating of its fuse. The rating is an indication of the time the car can keep running if the charging system quits and the headlights are on. Earlier most of their brands were low-maintenance, meaning water probably had to be added every 3-12 months, and JC was about the last company to make low-maintenance batteries, as opposed to maintenance-free ones.Ī size 51R battery probably has a reserve capacity of 60-90 minutes, meaning it can put out 25 amps for that long. About 5 years ago, I asked Johnson Controls if the Walmart batteries they made required adding water to them, and they said they were "refillable" and maintenance-free. If the caps are removable, and those caps look like they have screwdriver slots for prying them up, just like the Walmart battery I bought 15-20 years ago, then you can add distilled to it, but I don't know if you'll ever have to, unless the battery gets overcharged.
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