You need BMS or you need $100+ charger. Got to have one or the other, or you'll have bad feelings. A cheap $40 battery tender Lithium charger isn't going to cut it without a BMS.
I'm riding my bike below 10 degrees Fahrenheit. It starts with the button after the bike is warmed up. I rode at zero F when the condensation from warmer metal and freezing air caused moisture in the carb caused the slide to freeze solid to the carb. The battery in that video cranked and started the bike after the bike was warmed up. It started the bike several times in a 5 minute period waiting for people on the same day.
It will start your bike if any bike battery will.
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