Tech Logic VoiceLink II User Manual page 12

Drop-in Battery Chargers (BRC-30) (BRC-101) (BRC-202)
The battery chargers are specifically designed to recharge
NiMH batteries at an optimum rate for maximum operating
capacity and extended service life. The chargers feature a
recycle function, which is used to restore the battery charge
capacity and extend their service life.
BRC-30 charger recharges the (IRB-30) body-pack
transmitter and (IRH-30) handheld microphone. You merely
place the body-pack and handheld microphone in their
respective slot. Connection will be made and charging will
commence. Charger will automatically control the rate and maintain the charge.
BRC-101 and BRC-202 drop-in chargers are for the handheld
(IRH-30) and pendant transmitter (IRT-89). The single slot
(BRC-101) can charge either or the dual (BRC-202) can charge
both simultaneously. In addition, both have a tray to insert two
"AA" batteries for recharging.