Battery chargers are smart CC-CV and will automatically disconnect after battery is fully charged; you can leave them plugged overnight with confidence. Chargers are UL (C & US) Listed and stamped.
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Typically yes. The battery will warm up once it’s in use, however you will need to cover the battery to keep warm if it is left in -30C. The battery performance will drop down if the cells temperature reaches below 5 degrees Celsius.
It's gonna be tough to match a 125mm wide track with an existing mid-drive due to little chain off-set. For regular bicycle conversion we have the option to replace the crank axle to longer one, but for mid drive motor it's not generally doable ...
If the motor has the same dimensions and is compatible with our controller and batteries then it could theoretically work, but its not suggested as the motor may be under powered (and not give required performance), or it may be overpowered (damage ...