Sennheiser L 60 Charging Unit For BA 60 And BA 61 Transmitter Battery PacksThe Sennheiser L 60 Charging Unit allows you to recharge two BA 60 or BA 61 rechargeable transmitter battery packs at once. The automatic charging process ensures that the battery packs cannot be overcharged, eliminating memory effect. The L 60 charger allows you to simultaneously charge two BA 60 or two BA 61 or one BA 60 and one BA 61. Up to four L 60 units can be daisy chained and connected to a single NT 3 1 US power supply (available separately),