EXTENDED RUNTIME - Power your Nightstick 5522 series LED lights with this 3.7V 2600mA rechargeable lithium-ion battery, ensuring long-lasting performance during critical tasks. RELIABLE POWER SOURCE - Benefit from a dependable 3.7V 2600mA lithium-ion battery, designed as a direct replacement for your Nightstick lights, offering consistent and stable power. COMPACT DESIGN - Measuring just 3.1 x 1.5 x 1 inches and weighing only 2.5 oz, this battery provides a lightweight and space-saving power solution for your Nightstick devices. PEACE OF MIND - Enjoy a 2-year limited warranty, guaranteeing protection against manufacturing defects and ensuring your investment is secure with this Nightstick replacement battery.