The 10.0Ah ARC Lithium(TM) battery is the industry's most powerful battery. With 5 lighted segments around the power button, you can now see how much battery power you have left in 20% increments. In addition, the patented Keep Cool Cell technology keeps the cells cool and prolongs the life of the battery. The battery charges in 75 minutes with the rapid charger and in 190 minutes with the EGO POWER+ standard charger. It is compatible with all EGO POWER+ power equipment and chargers. 3-year limited warranty.