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Why are you using a lithium battery vs a deep cycle lead acid?

Take a deep cycle to full discharge and you can charge it. Take a lithium to full discharge and it's garbage.

Then there's the cold weather performance and charging issues that lithium has.

A BMS balances cells and reports on conditions - it's not a charger, though it can control one.

If you're using an Optima car battery - different's designed to charge off a voltage source.
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