well , the minnowboard(another sbc, http://www.adiengineering.com/products/m...rd-turbot/ ) also does not have overvoltage protection. there has been quite a bit of discussion on mailing list about damage due to user having plugged in something other that 5v and some have said that damage generally does not occur unless greater that 7v. like 9v. on the minnowboard the current takes out an IC NCT3012S TR which is primary voltage/current distribution and that particular chip is easy to replace thus bring most of the dead boards back. only if pine64 life was as easy. and this is power supply, not battery. so that is why i kinda question that a 7v, or 7.4v battery can cause real bad damage. maybe it can damage significantly at that voltage, it would surprise me. i mean we live in a world where a lot of 3.3v is tolerant of 5v. it would be nice if i was able to discern current flow from looking at a schematic chart, but i can't 
