Amazon.com: Keeppower USB Rechargeable Li-ion AA Batteries 3390mWh Double A Protected Lithium Battery 1.5V 2260mAh High Capacity Fast Charge Included with a 4-in-1 Charging Cable (Pack of 4) : Health & Household
The Anatomy of a Protected Battery
Amazon.com: KeepPower 16650 2100mAh 3.7V Rechargeable li-ion Protected Battery 7.77Wh (Replacement for 2 x CR123) : Health & Household