A fully charged 4S LiFePO4 battery will be about 14v. Well within the KX3 limits. > On Jun 9, 2017, at 8:09 PM, Nr4c <nr4c at widomaker.com> wrote: > > I believe a fully charged 4S LiPo battery will exceed the max input voltage of a KX3! > > Sent from my iPhone > ...nr4c. bill > > > Grant NQ5T K3 #2091, KX3 #8342