How do you you know if your computer hardware is overloading your UPS? You don't unless you ask the UPS. Most of the Smart-UPS™ models have a built-in computer and serial port (9 pin female connector on back) to which a Pocket PC with Pocket UPS software and a cable can be connected. 

Once connected, start Pocket UPS and everything else is automatic.  Whether you need to check for an overloaded UPS, test battery condition, monitor high/low input voltage or just check the UPS temperature, Pocket UPS makes it easy.

Pocket UPS should work on any APC Smart UPS™ with a serial port (most of them).  Pocket UPS has been tested on the following UPS units.

You can easily make your own cable adapter to connect the 9 pin female serial cable connector on your hot sync cradle (or standalone hot sync serial cable) to the UPS. Follow this cabling diagram to add three wires between two 9 pin male connectors which are available from Radio Shack.

IPAQ Hot Sync Cradle Serial Cable to UPS Cabling

Cradle DB-9M             UPS DB-9M
  Tx 2-------------------->1 Rx
  Rx 3<--------------------2 Tx
 Gnd 9---------------------9 Gnd