SL-B34 RECHARGEABLE BATTERY 1 Pack The Streamlight SL-B34 rechargeable battery (22131) is a lithium-ion (Li-ion) battery with a capacity of 3500mAh and operates at 3.6 volts. It features an integrated USB-C port for convenient charging and includes safety control circuitry to protect against overcharge and over-discharge. This battery is compatible with specific Streamlight flashlights, such as the MegaStream USB flashlight. Mfg: Streamlight