Streamlight SL-B26 Protected Li-Ion USB Rechargeable Battery Pack 3.7V 2600mAh Pack of 2. This new battery reinvents rechargeability and provides an alternate power source for our products that accept 18650 batteries or standard CR123A batteries. 18650 button top lithium ion battery with on-board safety control circuit Micro-USB input; charges in 5 hours Integrated safety circuit protects battery from overdischarge/overcharge Specifications for Streamlight SL-B26 Protected Li-Ion USB Rechargeable Battery Pack: Manufacturer: Streamlight Battery Quantity: 2 Battery Capacity: 2600 mAh Length: 2.75 in Condition: New Battery Type: Stand Alone Lithium Package Contents: Streamlight SL-B26 Protected Li-Ion USB Rechargeable Battery Pack Streamlight 22102: SL-B26 Protected Li-Ion USB Rechargeable Battery Pack 3.7V 2600mAh Pack of