"Philips Electronics is introducing a mobile phone with a built-in compartment for an ordinary AAA battery to power the device when the main battery runs low."

The AAA battery inserted into the phone can be of any brand or type, whether rechargeable or disposable. In the case of a rechargeable, the phone will recharge both the main battery and the backup AAA when it is plugged into an electrical outlet.

The companies say the AAA battery can provide up to three extra hours of talk time.