I use 3S1P LiPo packs, but because I use RC speed controllers Ebay link that are only rated at 2S ( I use these because they are the smallest available but they will die with 3S ) I have a voltage reducer Ebay voltage reducer before the electronics. I adjust this to about 9.6V. Also important if using LiPo is an alarm to warn if the voltage of the cells gets too low Ebay low voltage alarm.
The ebay links are where I have bought from without issues, plenty of other sellers have identical items as well.