This Charger (DCNM-WCH05) can simultaneously charge up to 5 Battery Packs (DCNM-WLIION). The charging status of each Battery Pack is shown on individual charge capacity LED indicators. The Battery Packs can be left in the Charger when fully charged. This has no impact on charging level and life time of the Battery Packs. The Charger is intended for wall mounting, but is also suitable for tabletop use. The loop-through mains power supply sockets allows a maximum number of chargers to be connected in series to share from the same mains power supply outlet: A maximum of 2 chargers can be connected in series for 100-127 Vac, 50-60 Hertz regions at 10A. A maximum of 5 chargers can be connected in series for 220-240 Vac, 50-60 Hertz regions at 10A.