Ok, I've read a lot on extended batteries and stock batteries but I decided to do a fast battery test of my own. Don't know if this helps anyone else - and I know this is http://asrs.arc.nasa.gov/docs/rpsts/ped.pdfanecdotal. I suspect there was less traffic on the network when I was doing the extended battery.
I have an unrooted EVO with sync'ing, WiFi, 4G, Bluetooth, and most other things turned off while in my house. I don't run a task killer. (Normally I have WiFi on but for this test I turned it off.) I bought a 3500 mAh battery from the link below. I figured - what the heck - it's $9.00 bucks!
3500mAh Extended Battery + Cover for Sprint HTC EVO 4G - eBay (item 200556328152 end time Dec-28-10 17:31:03 PST)
This morning I got up and put an almost fully charged extended battery in it. I was at 95%. I just let it boot normally all the bloatware and stuff comes on. I went to Sprint TV and went to the full episodes on USA Network and just started playing full episodes Psych (with sound off). I get about 1.5 to 2 3G bars in my house. I kept this phone on the same table for both tests to take out the variable of better reception in various parts of the house. It took 191 minutes (3hours 11 minutes) for it to reach the 15% warning. That equates to .418848% drop per minute.
Then I swapped in the stock battery. It was 100% charged right from the wall charger. It took 162 minutes (2 hours 42 minutes) to reach that same 15% notification playing the same program over and over again. That means it equates to .524691% drop per minute.
I've had the extended battery for a couple of weeks. I think it has had enough cycles to fully charge.
Personally, I'm a bit disappointed. That is only a 20% increase. Going from a 1500 to a 3500 - I'd have thought it would be better.
The shipping was a long time (@20 days) and the seller was upfront about that. But the battery leaves a lot to be desired. I think I am back to my stock battery and my spare stock battery (don't ask).
Two other anecdotal observations. First, the stock battery test (later in the morning) actually dropped the connection a couple of times but I was paying attention. Second, the video while using the extended battery was much more smooth than the stock battery. Both of these points tend to support the assumption that there was more traffic during the stock battery test - and it was still only 20% worse.....
Hope this helps folks out there.
I have an unrooted EVO with sync'ing, WiFi, 4G, Bluetooth, and most other things turned off while in my house. I don't run a task killer. (Normally I have WiFi on but for this test I turned it off.) I bought a 3500 mAh battery from the link below. I figured - what the heck - it's $9.00 bucks!
This morning I got up and put an almost fully charged extended battery in it. I was at 95%. I just let it boot normally all the bloatware and stuff comes on. I went to Sprint TV and went to the full episodes on USA Network and just started playing full episodes Psych (with sound off). I get about 1.5 to 2 3G bars in my house. I kept this phone on the same table for both tests to take out the variable of better reception in various parts of the house. It took 191 minutes (3hours 11 minutes) for it to reach the 15% warning. That equates to .418848% drop per minute.
Then I swapped in the stock battery. It was 100% charged right from the wall charger. It took 162 minutes (2 hours 42 minutes) to reach that same 15% notification playing the same program over and over again. That means it equates to .524691% drop per minute.
I've had the extended battery for a couple of weeks. I think it has had enough cycles to fully charge.
Personally, I'm a bit disappointed. That is only a 20% increase. Going from a 1500 to a 3500 - I'd have thought it would be better.
The shipping was a long time (@20 days) and the seller was upfront about that. But the battery leaves a lot to be desired. I think I am back to my stock battery and my spare stock battery (don't ask).
Two other anecdotal observations. First, the stock battery test (later in the morning) actually dropped the connection a couple of times but I was paying attention. Second, the video while using the extended battery was much more smooth than the stock battery. Both of these points tend to support the assumption that there was more traffic during the stock battery test - and it was still only 20% worse.....
Hope this helps folks out there.