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I'm not sure what the specs are for sealed batteries, but with the flooded batts in the ForkenSwift, you are supposed to avoid drawing the voltage down below 1.75v per cell (5.25v per 6v battery, 10.5v per 12v battery).
Anything below that risks cell reversal, which if it happens will, as Ryland says, ruin the battery and dramatically reduce range & performance of the remaining batteries.
Following those rules, you shouldn't draw a 36v pack below 31.5v. Now, as I said, sealed may have a different threshold. I'm not sure.
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