The Olympia Tools® X20S™ Li-ion Battery has a digital charge level indicator with minimal self-discharge. X20S™ batteries and chargers are 100% compatible with all tools in the X20S™ 20V range.
Specification:
Charge Time with X20S™ Fast Charger: 2.0Ah = 1 hour, 4.0Ah = 2 hours.