GT Power SD4 III 50W AC 4A Charger (UK) GTP0166GT Power SD4 III 50W AC 4A Charger (UK) GTP0166 Key Features 50W output power. Multiple charge currents (0. 5A, 1A, 1. 5A, 2A, 2. 5A, 3A, 3. 5A and 4A). Suits 2 4S LiXX and 4 8S NiXX packs. Easy to use (simple two button interface). LED status light. LED display. JST XH balance ports. Product Description Given that most cars, aircraft and boats rarely use anything larger than a 4S LiPo, and since most of us prefer not to top up at the field, track or