Bright Eyes 10,400mAh Bike Light Battery: Ultra capacity for enduring long rides with enduring bright lights. Upgrade Your Battery: Replaces Bright Eyes Stamina battery, Upgrades Helios, and Blaze models for longer runtime. Versatile: Also compatible with most similar 8.4v external battery bike lights Proudly USA-Based: Unlike our competition, we are proud to be a USA-based company, committed to delivering quality and reliable products while providing excellent support to our customers across the nation. Bright Eyes 10,400mAh Bike Light Battery - Now Higher Capacity - Works with CREE T6 LED 1200lm or 1800lm Bike Lights - 8.4v (10,400mAh BATTERY ONLY)