battery keeps draining or is it bad? - JeepForum.com
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post #1 of 4 Old 12-02-2019, 08:28 PM Thread Starter
wpatters1229
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battery keeps draining or is it bad?

This is a battery in a 1993 jeep grand Cherokee. It sits for 3 or 4 days and the battery drains down to barely able to start. The alternator is good but for some reason, it is either being drained or can not hold a charge. I tested the drain at .369 volts when everything is off. From what I have read this is normal for this car.
My other question is how do you know if a 1 yr old battery is bad? it has been drained down to almost nothing because the jeep sat for a while why we tried to get funds to repair the engine. Will that kill the battery? It will take a charge from a battery charger but 3 or 4 days later it is run down.
How to test if there is a bad cell? I have a hydrometer.

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post #2 of 4 Old 12-03-2019, 10:20 PM
GOLDWING
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Quote:
Originally Posted by wpatters1229 View Post
This is a battery in a 1993 jeep grand Cherokee. It sits for 3 or 4 days and the battery drains down to barely able to start. The alternator is good but for some reason, it is either being drained or can not hold a charge. I tested the drain at .369 volts when everything is off. From what I have read this is normal for this car.
My other question is how do you know if a 1 yr old battery is bad? it has been drained down to almost nothing because the jeep sat for a while why we tried to get funds to repair the engine. Will that kill the battery? It will take a charge from a battery charger but 3 or 4 days later it is run down.
How to test if there is a bad cell? I have a hydrometer.
Charge the battery and disconnect it from the ZJ. Take a voltage reading with your DVM. Check the voltage a day later and if it is lower, have the battery load tested. If the voltage stays up, youtube Eric the car guy, (parasitic drain)

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post #3 of 4 Old Today, 09:39 AM
Mel63
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I was having the same issue with a battery that was less than a year old, checked everything for a draw, finally had the battery tested and it proved to be bad, got a new one under warranty and have not had a problem since... who would have thought lol
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post #4 of 4 Old Today, 09:58 AM
wingless
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Quote:
Originally Posted by GOLDWING View Post
Charge the battery and disconnect it from the ZJ. Take a voltage reading with your DVM. Check the voltage a day later and if it is lower, have the battery load tested. If the voltage stays up, youtube Eric the car guy, (parasitic drain)
This is correct.

When I test my battery, I first bring it to 100% state of charge, let it sit disconnected for a day, then use my carbon pile load set to discharge a good battery at the C/20 hours rate, where C is the battery Ampere-hour rating, such as 100Ah. In that example 100Ah/20h = 5A discharge load applied.

A battery with usable life will have greater than 50% capacity, or 10 hours of discharge life.




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