Greenworks PRO 80V 4.0 AH Lithium Ion Battery GBA80400 Rapid charge of 1 hr. to full capacity One battery, Multiple Tool Compatibility. Compatible with 80V charger model GCH8040 On board LED lights fuel indicator for on demand reference of remaining power. For Use With Greenworks 80V Most Tools Lithium-ion technology delivers maximum performance and fade free power to complete the job at hand Note-battery is not shipped fully charged. It is recommended to fully charge before first use to ensure that maximum run time can be achieved. This lithium-ion battery will not develop a memory and may be charged at any time