Ultra-high capacity rechargeable lithium battery allow you to get incredible runtime out of the LED bicycle light. Roughly the same size as two CR123 batteries, each 18650 is 3.7V and 2600 MAh. These are TRC batteries, which have low self discharge rates and no memory. A protection circuit is attached to the battery to ensure that you do not overcharge or over discharge the battery. As with all lithium batteries, the proper care needs to be observed. Do not overheat, incinerate, reverse polarity, mix voltages, or do any other potentially dangerous activity with these or any other lithium batteries.

Specifications:

• Battery：4×18650 Li-ion battery (8.4V 5.2AH)
• Battery life:500 times cycle
• Charger：DC 8.4V/1.8A
• Charge cut-down Current: 88mA
• Charging time：4 hours (use only with Lumintrek charger)
• Storage Temperature: -20C ~ 45C
• Temperature (Charge): 0C ~ 45C
• Temperature (Discharge): -20C ~ 45C
• Self-Discharge (Month): < 10%
• -20C /25C Capacity Ratio: >60%
• Sealed in a water-proof plastic cover
• Waterproof grade：IP67
• Size：L68*W37*H37 mm
• N.W.：<225g
• Comes in a nylon battery bag, with strap to attach to bicycle frame.

Warranty: 180 days manufacturer warranty.