The RTS CHG-1800-LI4 4-Bay Battery Charger simultaneously charges up to 4 RTS BP-240 battery packs.The TR-240 & TR-1800 beltpacks have a dedicated removable Li-Ion battery pack that provides up to eight hours of un-interrupted operation. The battery pack can be charged directly in the case by plugging the included power adapter into the beltpack or by placing the battery into an optional CHG-1800-LI4 four-bay charger.