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Old 05-09-2022, 03:45 PM   #26
Pat911
Gone Wild
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Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,919
Default Re: Lithium discharge question

I’ll assume you’ve got LiFePO4 lithium batteries as that’s the most common high capacity chemistry being sold to the general public at the moment and that they contain 16 cells (16S). The reason you’re confused is that the discharge curve for LiFePO4 is very, very flat and you cannot cross reference voltage with state of charge. A fully charged “48v” LiFePO4 battery can be as low as 53.6v after settling. A fully depleted battery can be as high as 49v after settling. 50v is pretty much a dead “48v” LiFePO4 battery.

To fully charge your battery you will need from 55.2v to 58.4v. 56.8v is a good charging voltage for 16s LiFePO4, but I would be very wary about setting a charge voltage without knowing your exact battery specs.

As said previously, something is wrong with either your charger or BMS and you should contact your supplier.

Cheers
Pat.
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