Model: COMP-RB-7422 The rechargeable Li-Ion battery is used to power COMPCOOLER Personal ICE Cooling Systems including Backpack, Waistpack, Univest and ICE Chest Cooling System. Each of these personal cooling systems incorporate a frozen (water) bladder and pump to produce flowing cooled water to a tubing-lined garment, pad or other device. This rechargeable battery is sized to efficiently power this type of system for 8 – 10 hours and includes a charger. Pressing “Remaining Battery Capacity” on the battery indicates, by percentage, how full the battery is. Three Led lights indicate 80-100% capacity, two lights indicate 60-80% capacity and one light indicate ≤ 50% capacity. Reference illustration at right. Typical charge time to ‘full' is 4 hours.