You need a USB Charger Cable.

For example THIS USB cable Sync and charge your PDA/Pocket PC/Handheld at the same time with the PC/Laptop. No more bulky A/C adapter or cradle to carry when you travel. One of the best USB hotsync data cable for your Palm Zire 72!

Features:

-Auto Sync and charge your PDA handheld devices at the same time.
-Directly connects with USB port, no extra power source needed.
-Plug and play, need not software installation
-Lightweight and compact, fits easily into your briefcase
-Eliminates the need for cradle and AC/DC converter when traveling

Source: yahoo.net