It was a matter of time before something had to be done about known issue of G1 phones and its battery weakness. So in anticipation of my upcoming #aycj trip I figured I'd buy myself an extended one.
Extended High Capacity 2200mAh Phone Battery for Google Android G1.
Figured I wouldn't want to spend more than $20, my choice ended with Amazon's Extended High Capacity 2200mAh Phone Battery, which was $19.66 shipped. When I got it, I decided to take it through two full charge cycles. I didn't even know if that was needed or effective, I just heard that it's good for a new battery. But even for the sake of testing, I did that, just to get a feeling how long it lasts. From initial charge, I was impressed. Battery lasted one full day with almost all essential options (including GPS and auto-sync) turned on. I had maybe 1 hour phone conversation, 1 hour music playback in the car, and few hours playing with various apps. Auto-sync was on at all times as new email came in and calendar events arrived. After one full day of such operation, I decided to leave screen on all the time to try to drain the battery. It took about few hours to discharge.
To conclude, it appears to be good investment. It is cheap and it does what is expected of it. One thing remaining to see is how long this battery will live.