High quality Elmdene 12V DC Boxed Switch Mode Power Supply Units in various Amp outputs (All units use 0.5A to charge battery*). Efficient Switch Mode operation without battery monitoring. 1A, 2A and 3 Amp PSUs are supplied in a Size A (230mm x 200mm x 80mm) case 4A 5A and Battery Monitored PSUs are supplied in size C case (330mmWx275mmHx80mmD) *Battery not included.