NiMH batteries generally provide at least 30% more talk time than NiCd batteries and take approximately 20% longer to charge. NiMH batteries are also considered more "environmentally friendly" than NiCd batteries and are not susceptible to memory effect. (Memory Effect refers to a NiCd battery's inability to be charged to full capacity over time.)

Lithium Ion batteries are high-energy-density batteries that offer increased capacity and weigh less than similar sized Nickel Cadmium (NiCd) and Nickel Metal Hydride (NiMH) batteries.

Since battery and charger types vary among phone models, it's best to refer to your owner's manual for specific instructions on battery-charging procedures.

A hands-free device uses a remote speaker and microphone with a cellular phone allowing a user to talk without holding the handset.

The cigarette-lighter adapter is a power cord that plugs into the bottom of a cellular phone on one end and into a cigarette-lighter outlet on the other. This cord enables a portable phone to be powered by a car battery and it either trickle-charges or rapid-charges the battery.

A battery eliminator is similar to a cigarette-lighter adapter in that it allows a cellular phone to receive power from a car battery. To use a battery eliminator, remove the battery from the portable phone, replace it with the battery eliminator, and plug the other end into the cigarette-lighter outlet.