Thanks for all the input. I just got a new charger about a month ago and it does support LiPo. I think im gonna move to LiPo. But my ESC does not have a cutoff voltage, its an old Tekin G-12c which was great 10 years ago. Do you think this voltage buzzer would do?

www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXADUK&P=7
(copy and paste link into browser)

Looks like it plugs into the balance plug and sounds off when the cells get to low.

Thanks