Phones with Nickel metal hydride batteries that have greater capacity and do not have battery memory syndrome are better. The Nickel metal hydride batteries take about as many recharges as Nickel metal hydride batteries. The Nickel metal hydride batteries are durable and do not develop memory problems. Nickel Metal Hydride batteries are interchangeable with most Nickel Cadmium batteries. The NiMh batteries generally deliver 10-25% greater capacity than Nickel Cadmium batteries. The Nickel Metal Hydride batteries are environmentally friendlier than Nickel Cadmium batteries since they do not contain cadmium.

Lithium Ion (Li-Ion) battery is one of the newer rechargeable battery technologies used. Lithium Ion batteries are one of the lightest rechargeable batteries available today. Lithium Ion batteries can deliver 40% more capacity than comparably sized Nickel-Cadmium rechargeable batteries. Lithium Ion battery technology is one of the more expensive rechargeable battery technology.

A rechargeable battery having accurate and reliable state-of-charge will improve the performance and reliability, and will ultimately lengthen the lifetime of the battery. Quality cordless phone batteries can boost the performance of your cordless phone handset by giving longer battery life for increased talk time and longer standby time away from the charging cradle. Even though newer battery types may not have the memory problems, all batteries may wear out eventually after repeated recharging.

Generally, in order to improve the life of the cordless phone batteries, clean the charge contacts on the base and the handset with a pencil eraser once in every month. Also completely discharge the battery and then recharge it once in every month. If the battery does not recharge, replace it.

The need to regularly lifepo4 batteries used in cordless phones and mobile phones may be eliminated in the future with the use of fuel cells which are one type of electrochemical cell. STMicroelectronics has developed fuel cells that are reportedly small enough to fit inside a cordless phone or mobile phone handset and are able to generate all the electrical energy needed to power the phone from liquid methanol, a low-cost and easily available organic fuel.