Lithium batteries been charged at 40a when SOC reads 100%, will they be damaged (1 Viewer)

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Dec 5, 2022
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Hi all I have two poweroad 100a lithiums that shut down after 24hrs if no demand, when the bms wakes up when vehicle is started the battery screen shows an input of 40a from b2b when the batteries soc is at 100% as indicated by blue tooth, this happens for approx 5 min before dropping and then stops charging, will this 5 min burst of 40a charging damage the batteries?
it's a new installation and want to be correct with my facts before I go back to the fitting company.
 

Tombola

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you may want to see this thread.


you dont really want full charge on an over depleted lithium battery right from the off, try with a proper 3 stage see what that does, but advise reading the thread above.
 
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Tombola

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ahhh wait a minute sorry, are you saying the b2b charges them when it is already full for a short spell, sorry, ?
 
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bigtwin

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Hi all I have two poweroad 100a lithiums that shut down after 24hrs if no demand, when the bms wakes up when vehicle is started the battery screen shows an input of 40a from b2b when the batteries soc is at 100% as indicated by blue tooth, this happens for approx 5 min before dropping and then stops charging, will this 5 min burst of 40a charging damage the batteries?
it's a new installation and want to be correct with my facts before I go back to the fitting company.

I wouldn’t be worried about that; LiFePO4s can accept high charge rates and 40A isn’t particularly high.

you dont really want full charge on an over depleted lithium battery right

The battery isn’t depleted; it has isolated itself as a consequence of there being no load applied.

Ian
 
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chippie
Dec 5, 2022
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Yep that's correct, when the batteries are 100% and have no demand the bms shuts down, when the bms starts back up according to the battery monitor the b2b puts in 40a straight off then drops off after about 5min.
 
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