Rechargeable hand warmers charge from a USB port on a laptop or wall outlet, and many of them can also work as a backup battery for your phone. This kind of hand warmer makes the most sense if you ...

Is your phone, tablet, or laptop typically in the battery red zone before the day's end? These portable chargers and power banks give you the most boost when you're out of juice. I’m a Mobile ...

Cellphones of the past came equipped with rechargeable nickel-based batteries with (Ni-Cd and NiMH). In the past few years, however, most rechargeable batteries used in phones are Lithium-based.