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Originally Posted by https://www.batteriesplus.com/blog/power/lithium-batteries-cold
Lithium iron phosphate batteries do face one major disadvantage in cold weather; they can't be charged at freezing temperatures. You should never attempt to charge a LiFePO4 battery if the temperature is below 32°F. Doing so can cause lithium plating, a process that lowers your battery's capacity and can cause short circuits, damaging it irreparably.
In order to charge a LiFePO4 battery in below-freezing conditions, you need to raise its temperature first. The easiest way to do this is to simply move the battery to a warmer environment. You can also try wrapping the battery in a thermal blanket, or placing it near a small space heater.
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This is something to keep in mind for the people that ride year-round. The way our electrical systems are set up, it's essentially charging any time the engine is running.
A good LiFePO4 with a smart battery management system would probably account for that and prevent charging the actual cells, but even if it blocks charging to prevent damage, you'd still end up not charging your battery (which could be an unwelcome surprise a bit later).
Just saw in the BT manual that their BMS does indeed monitor the temperature, so you won't damage the battery in cold temps.
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Originally Posted by https://www.batterytender.com/core/media/media.nl?id=773035&c=3854271&h=YYeJxnxdIvAx12LFYv13GF2gNmATsklRF0WiVrnNrpLsIDgZ
The battery BMS will turn the battery off when temperatures approach freezing to protect the battery from damage. To activate the battery simply press the RESET button located at the end of the Quick Disconnect (QDC) charging harness for ONE second, then if the engine fails to start on the first try, a load such as the headlights can be used to warm the battery. The length of time it takes to warm the battery depends on its temperature. The colder the weather, the longer it will take to warm the battery sufficiently. Five minutes is a good rule of thumb when the temperature is below freezing. Keeping the battery fully charged will improve cold weather starting.
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It sounds like it completely cuts the battery off when it gets too cold. Might have to reset the bike's clock if it gets too cold sitting over the winter...