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Old 08-09-2022, 06:12 PM   #1
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Rexhall Owners Group
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Lithium batteries not taking much charge from Converter

Momentary short of battery may have caused the problem but not sure. Several months ago when I was replacing the BMS I think I shorted one of the batteries. These are Lion Energy Lithium which can be reset. I did so and thought everything was fine. However, lately they don't seem to be accepting a charge from the Converter and even while on the road, they're not taking as much charge from the alternator as they did previously.

I replaced my Victron 700 since the plug to the shunt broke. They don't make a replacement plug so bought a cheap Chinese knockoff. Not sure if that's working properly. The other possibility is my 17 year old WFCO converter is starting to fail. I'll probably replace the converter with something more suitable for lithium but before doing that want to make sure the batteries are not damaged.

Anyone know how to determine if Lithium batteries are damaged?

Also, if not, what converter do you recommend? I know of one with a switch which can be used to charge either the chassis battery or house batteries.
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Old 08-09-2022, 07:55 PM   #2
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Could the old, bad BMS have damaged a cell ?
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Old 08-09-2022, 09:40 PM   #3
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Check the voltage on each cell. If they're not the same you're going to have to rebalance them. Read up on it. Very heavy draws like a car or ACs you bottom balance, lighter draws like refers, TV's, short bursts of the microwave, coffee makers, etc you top balance.
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