i have been using a lithium battery and a tender for about 2 years and zero problems since. it spins this big motor easily.
Btw, it is much lighter if that is of interest.
Antigravity battery I believe it is the HD-20. I posted the install here in TM.

Last edited by LightSpeed; 18/09/22 01:04 AM.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)