RE: Replacing ESC and receiver, how do I choose?
Oooops......my bad. Yeah, even tho a LiPo is rated 7.4V, it charges up to about 8.4V. A LiPo is discharged when it reaches about 7 volts. Rule of thumb: you don't want to discharge a LiPo below 3.2V per cell, 3.4V for safety margin, or 6.8V for a 2S Lipo. If you go below 3V your LiPo battery is damaged and should not be recharged.