Looking for a good battery to replace stock battery.
ATZ7-RS Lithium Motorcycle Battery
I can recommend the Antigravity ATZ-7 Restart lithium battery which I've had in my 2019 Monkey for a few years. Its technology never lets the battery die down to zero. It reserves enough juice so you can start-up power from either a push on a button on top of the battery or by using an SAE remote (Restart Remote, Powersport Batts) via an SAE connected from the battery to the outside of your seat. It's made it through two DC-area winters with no need for trickle charging. Also saves you a few pounds because it's so light compared to original.