My old charger was stolen so I replaced it with this one. I'm so impressed! I plugged it in, plugged it in and it immediately recognized my 12 volt jeep battery. The display showed low battery. I woke up in the morning and the little battery diagram showed a full battery and the display had the word "FULL". No need to read instructions or wonder what's going on. I would buy this product again in a heartbeat! Five stars all the way!