Upgrade your cordless tool arsenal with the Olympia Power Tools X20S 20V 4.0Ah Li-ion Battery. This battery features a digital charge level indicator to always show the battery status. It offers maximum functionality and is compatible with all tools in the X20S 20V range. Benefit from the minimal self-discharge feature, allowing the battery to retain its charge when not in use. Charge Time with X20S Fast Charger: 4.0Ah = 2 hours.