the kbox can only put out 10 amps so any IMR battery with a continuous 20 amp discharge rating will keep you well in the clear in terms of safety. samsung 25r, purple efest 35a, sony vtcs, lg he2 or he4s all good batteries. i think the VAPPOWER are just rewrapped LGs from the quick search i just did. id go with he4s or 25rs for this application