When my just-fully-charged 12V (nominal) LiFePO4 batteries are only driving a voltmeter (13 uA discharge rate), they measure around 14 volts. But once the discharge rate reaches 1A or so (on a 6Ah battery), the voltage is down to around 13.5 and drops from there as the current rises or time passes. During most of the discharge period, they're between 13.0 and 13.1V. If you discharge them at a rate greater than C/4, the voltage will be even lower. You'll also have a few tenths of an ohm in your cabling which will drop the voltage further. So I think you'd be safe with a 12-cell string powering a motor that has a specified maximum of 40.8V.
Cheers
Halden
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