The Jin Ming Scar V2 Toy Gel Blaster has Jin Ming Generation 8 gearbox and is the latest product available. When charging the batteries, we recommend charging them between 1-4 hours. When they are charging the lights will flash and once it is fully charged, the light/s will turn a solid red or green. Also once you start to hear the battery getting flat, please recharge it as running it flat can damage the cells.