got my HTC battery Friday, drained and recharged 3 times do far...
Seeing ... maybe a 10% improvement....
I'll keep on using and draining, maybe, I'll get better usage, but... not hoping for much..
Bought a 2300mAh extended battery, I just don't want to curb my usage.... I will 'suffer' with a slightly larger unit... I want to use my G1 and not worry about a dead battery.
When I get my 2300mAh, I'll write about its power...
Well, the 'new' replacement battery from HTC is a wee bit better. I recharged 3 rather than 5 times a day (for my type of use -- fairly heavy).
Got my 2300mAh today, 60% charged. Going to drain, recharge, etc...
more forthcoming

I have accomplished 2 full drains (letting the phone turn itself off).
today, with my normal usage, I have 60% charge left after 12 hours.
I like the feel of the 'hump" for texting and just holding it.
I would recommend this battery.
I bought on
eBay, from this
seller