Vivitar Vpower Compact Battery Charger with 4 AAA NiMH Rechargeable Batteries - Perfect for Cameras, Toys, and Electronic Devices

Use these to replace rechargeable s in a couple of portable phones. They lose a bar right away but still outlast the old ones by twice the amount of time. Also use them in a hand held "Pocket Radar Smart Coach" radar gun. You don't have a light to let you know when they are fully charged, but that isn't a big deal to me. They charge up over night.