From Parkside.
Powerful Lithium-Ion battery with a colour LED charge status indicator Cell balancing - longer run time, increased battery lifespan Longer battery run time and lifespan thanks to evenly loaded cells Maximises the charge potential Type: Lithium-Ion Rated voltage: 20V Capacity: 4Ah Compatible with all "X 20V TEAM" series devices 1 battery series – over 100 tools 3-year warranty