1-Slot Li-Ion Charger w/ LCD Display + 2 x 3.7 Volt Panasonic 18650 Lithium
Amazon.com: 7.4V Lithium-ion Battery Pack 5200mAh, AOLIKES Rechargeable Battery Power Cell w/XH2.54-2Pin Plug, DIY Batteries 18650 2S2P Li-ion Batteries Pack Support 3C Continuous Discharge : Health & Household
Amazon.com: Speedy 18650 Battery Charger XTAR PB2C USB Output Function, Portable Li-ion 18650 Battery Charger Box w/USB Port and LED Display for all 18650 Batteries(Batteries NOT included) : Electronics
Streamlight PolyTac X USB w/ 18650 Battery - Black