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Old 05-25-2016, 05:37 PM   #1
thetoddjohnson
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Default How much voltage differential is ok?

I left a DC to DC converter connected for the winter and it drained my pack. Oops! Three of the batteries drained all the way down to 0 V. Using an 8 V charger I individually charged those dead batteries. Each of them are now at 8 V. The other three batteries are at 8.5V. If I plug the whole string into a 48 V charger the three that are at 8.5V start to boil relatively quickly. I think I have three options and I would like opinions on the following three:

(1) Don't worry about it, just let it charge, let them boil and it'll all work out.

(2) Drive the cart in an attempt to deplete all of the batteries, then charge the bank. (Will this draw down from the 8.5V batteries or will it take the 8 V batteries down even lower?

(3) Use a trickle charger individually on the batteries and try to get them all to be roughly the same voltage before charging them together with the 48 V charger.

My gut tells me that option three is the best. If that is the case how close do I need them to be? Obviously half of a volt is too much.

Is there some other option that I'm not thinking about?

TJ

PS - All six batteries were new last June.
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Old 05-25-2016, 05:43 PM   #2
Swan
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Default Re: How much voltage differential is ok?

i would stick with #3 and hope for the best
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Old 08-12-2016, 08:42 PM   #3
Dragracer_Art
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Default Re: How much voltage differential is ok?

I know this is an old thread but I just thought I'd add my experience with SIX 8v batteries drained to ZERO.

I pulled them out of the cart and connected all in parallel... then charged with a 12v 2/10/50a car charger on and off over the course of a few days.
The batteries slowly came back to life and were all within a few 10ths of a volt of each other.
About a week into it I obtained a 20a 48v charger and have been keeping them charged up in the cart now. The pack usually settles out at 50.1-50.3v a day after charging.

Being the batteries are 9 years old... I don't trust them on a long ride but it's good enough to run the kid to the bus stop or joyride the other kids around.

The effort to save these old batteries was worth it in that it bought me more time to tinker with the cart before dropping a bunch of mone into new batteries.
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Old 09-14-2016, 08:32 PM   #4
dannyre
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Default Re: How much voltage differential is ok?

What is the normal voltage range for a fully charged 6-8v system? 50volts , 51volts, 52 volts?
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Old 09-14-2016, 09:43 PM   #5
teecro
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Default Re: How much voltage differential is ok?

Quote:
Originally Posted by dannyre View Post
What is the normal voltage range for a fully charged 6-8v system? 50volts , 51volts, 52 volts?
Fully Charged and Rested (off charger 12 hours) = 50.9 volts
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