What battery level should my Phone be at?

[KLE94]

Im using HTC Sync for my htc one m8 by verizon, its telling me my battery level is to low to repair. How charged does my phone need to be? ive read everything(I think) and could have possibly over looked this detail. could someone please help me?

 

[dpham00]

What is the exact error message?

 

[B. Diddy]

Welcome to Android Central! Your battery level is too low to "repair" what? Are you using HTC Sync to update or reinstall the firmware?