GCMCU5 is an external dual-bay main battery charger for T800 main batteries, supplied with a US power cord. Its two charging bays charge up to two main batteries simultaneously, while the charger also stores the two batteries together. This arrangement supports spare-battery management where space or available power sockets are limited. The charger measures L 160 x W 180 x H 72.5 mm and weighs 1.2 kg. Each bay has 5 LEDs for charge-status indication. It accepts 100-240 V AC input power and provides 13.05 V DC output at up to 2.4 A. Use this accessory to maintain T800 battery readiness for mobile work requiring batteries to be charged and kept in one location. The GCMCU5 ordering code identifies the version with a US power cord.