Battery Life
Fitted with a removable Li-Ion 1370 mAh battery, the P51 provided a standby time of up to 150 hours and talk time of up to 4 hours. These figures, while modest, were in line with expectations for business-friendly devices of its generation.
In summary, the BenQ-Siemens P51 was an ambitious device in its attempt to merge mobile telephony with practical PDA functionalities. While its hardware seems dated now, it represented a critical period in mobile device evolution, laying groundwork for future innovations. Its appeal would have largely been to enterprise users looking for productivity tools in a handheld format, though the rapid pace of technological advancement soon overshadowed its capabilities.