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You want a BMS. It's cheap insurance.
These things do not do well with over(the most likely problem) charging, or being drained down to nothing. They're not forgiving like lead-acid.
Under ideal circumstances, you might get away with using an active balancer instead...but the real world is anything but ideal.
You can always wire up the starter so it and it alone bypasses the BMS, if it's going to draw too much current for one.
Spend the $20 and save yourself the headache of ruining your cells.
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