I like this phone feature. Probably Energizer trying to sell more L92 AAA lithium batteries.
(
http://gizmodo.com/gadgets/cellphones/philips-adds-backupower-to-already-long+lasting-xenium-cellphones-247417.php )
(
http://www.uberphones.com/2007/03/others/xenium_phone_lasts_even_longer/ )
Philips, Energizer, and Techtium have worked together for some time to develop the AAA BackuPower cellphone. This extended power range model features a new backup embedded charging technology for mobile devices, making the Philips Xenium range of handsets even more impressive when it comes to longevity. A standard Xenium phone already boasts a standby time of up to 1 month on a single charge, and with the AAA BackuPower feature embedded, users can extend that period for another week by simply dropping a standard sized AAA battery.
=