Cree 8.4v Rechargeable Battery Pack For Bicycle Lights & Headlamps Li-ion PCB Protected Battery Spare Replacement (4 x 18650 batteries equivalent) - XM-L T6 - U2 - P7 - L2 LED - Universal Fit With Cree, Magic Shine, Gemini Bicycle Lights - 2 Year Manufacture Warranty (Choose 6400 or 8800 mAh) &#x2714;Take Longer Rides: 2 available capacity sizes Updated: 6400mAh, 8800mAh (For Extended Battery Use) &#x2714;Save Yourself Money In The Long Run: Beware of cheaper batteries that are prone to defects. Those cheaper battery packs are not able to hold its charge after several use, and it's only a matter of time before its useless; hence the saying &#x2714;Reliability Gives You Piece Of Mind: Rock-Solid Sealed ABS polymer case to endure the toughest weather conditions and impact. Plus thick cables built to lasts. &#x2714;Save Time & Straps On In Seconds: (No Tools Required). 9 size adjustable strap Fits Any Mountain / Road / BMX / Fixie / Specialized Bike). &#x2714;Win - Win Situation: 100% No question asked 60 day money back guarantee and 2 year manufacture warranty