Streamlight SL-B26 Protected Li-Ion USB Battery Pack - 8 Pack Streamlight 18650 Battery Power: The Streamlight SL-B26 is an 18650 battery pack with a rechargeable li-ion chemistry which supplies power to X-series dual fuel Streamlight flashlights and other 18650-compatible electronics. The SL-B26 includes safety protections like an overcharge/overdischarge protection circuit, pressure vents, and built-in surge protector. Additional features like the power indication lights allow you to stay apprised of the battery level at a glance when charging. Micro-USB Charging: A prominent feature of the SL-B26 is its in-body Micro-USB input, allowing you to conveniently connect the battery to a computer or other power source for recharging. Thanks to its lithium-ion chemistry, the SL-B26 can be recharged up to 500 times. Available here in a convenient 8-pack, you can support multiple electronics with rechargeable power or have multiple replacements ready to go. Features: - Rechargeable and reusable for 500 cycles - Features a power indicator and is protected against overcharge and overdischarge - Direct recharging with micro-USB port on the battery - 8 pack can be used as replacements or backup cells for 18650 products - Built with Streamlight X-series lights in mind but compatible with 18650 products - Full charge in 5 hours from total depletion - Minimal 1.7oz weight contributes little to the heaviness of lights - Reliable 2600mAh capacity supports consistent runtimes and lighting - Pressure vent and PTC surge protector built-in to provide additional safety