7.4v li-ion 1600mah battery wthin PCM proction De:36*65mm MSDS,CE,ULapprovel ICR 18650 7.4v li-ion 1600mah battery Features:1, Longer storage life ... any rechargeable battery3, Installed IC chip will prevent the battery pack from over charge and over discharge.It helps ... protect battery chemistry integrity and prolongs battery life.4, Installed polyswitch will cut off ...