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Li-Ion 18650 7.4V 2600 mAh 2x18650 2S Rechargeable Battery Pack with Built-in PCB Protection and output Bare Leads Features Assemble with high quality 3.7V Li-Ion rechargeable battery pack sealed with industrial Blue PVC Made of 2 Brand-new A grade cylindrical s with PCB and poly switch for full protection Light weight and higher energy density than any rechargeable battery No memory effect and rechargeable Longer storage life than NiMH battery Built-in IC chip will prevent battery pack from over charge, over discharge and prolongs battery life Perfect for building 7.4V battery pack for bike lighting, DVD external battery and other small electronic devices.