PdaParts.com (formally GetHighTech.com) now has instock an internal replacement battery for the Treo 600 that they claim will boost battery life by 25%-35%. The battery is a high capacity Lithium-Ion 3.7volt, 2000 mAh internal battery, and works with both GSM and Sprint Treos. The replacement battery costs $49.99.
This battery is a do-it-yourself upgrade. Taking apart your Treo 600 will void its warrenty, and should only be done by someone who knows what they are doing. That said, PdaParts.com does provide an illustrated step by step guide to installing the battery, and they also sell the hard to find Torx screwdrivers for $9.99, and a tool to open the Treo's plastic case for $4.99. (This is the hardest part of opening any PDA - you can snap the the plastic tabs that hold the case together, or you can worse, rip cables that are near the edge of the case.)
The claims of 25-35% more battery life seem slightly extreme, given that the current Treo 600 has a 1800 mAh battery built in. Strictly by mAh, this new battery only has 11% more power available than the previous one. Still, a 25% increase of battery life would yield a 7.5 hour talk time for the GSM Treo 600, and a 5 hour talk time for CDMA Treo 600 - and days of standby time for both. PalmOne does sell an external battery for the Treo 600 (available online for about $50), however its bulky size will likely dissuade most users who are looking for that extra hour.
