Rest your KDC470 with its Extended Battery Companion and host device in the cradle to charge them simultaneously. The Cradle includes a charging slot for an extra KDC470 battery as well an a charging slot for an extra 2,000mAh extended battery. When combined with a host device and one of KOAMTAC's custom SmartSled Charging Cases, both devices will charge via the pogo pins. If using the extra battery slots as well, all devices will charge simultaneously.