A sub-battery pack capable of providing a charging function, a sub-battery pack function, and a cradling function is disclosed. A sub-battery pack for a portable communication terminal includes a cradle housing to receive the portable communication terminal, a battery pack to cradle the portable communication...http://www.google.fr/patents/US20080108395?utm_source=gb-gplus-shareBrevet US20080108395 - PORTABLE SUB-BATTERY PACK, PORTABLE COMMUNICATION TERMINAL, AND SYSTEM FOR CRADLING PORTABLE COMMUNICATION TERMINAL
PORTABLE SUB-BATTERY PACK, PORTABLE COMMUNICATION TERMINAL, AND SYSTEM FOR ...
