I use my car once every week or other week for 30min drives off course that is bad and damaged my car battery, the question is can I now revive this dead battery ? it failed me today I jumped started it then drove for 30 min and it won’t start again I put it in a battery charger it went from 11 v to 13 v in less than an hour with very low current but after an another hour sitting in my garage the voltage dropped to 12.6 V without even being connected to the car !
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12.65 volts is a full charge…
12.45 volts is a 3/4 charge
12.25 volts is a half charge…
i hook up the battery and turn on the headlights for a minute. then turn them off. then read the voltage…
see my test chart… https://i.imgur.com/SnzhDh0.jpg
New battery?
That doesn’t sound like a bad battery. Best way to “revive” a bad car battery is to charge it. Leave it on the charger for a week, if it’s still not good, it’s bad. The only way a lead acid battery might be able to be revived is if it’s sulfated, overcharging, or leaving the battery on a new charger that will trickle charge the battery will usually break this sulfation up, but it takes time, usually a week. If it doesn’t improve after a week, it’s not sulfation, it’s something else like broken plates, a dried out or shorted cell, something that can’t be fixed and the battery is bad.
Most car batteries don’t come back after they’ve failed, I’d personally just throw in the cheapest battery you can buy, like a $50 Walmart special, and just know it’ll need to be replaced every couple of years.
