For those complaining about battery not holding 100% - this has worrked for me time and again since PalmOS.
I have bought 4 of those China batteries - 2 for my Samsung Moment and 2 for my Samsung Epic and had one of each lasted only 2 hours so I tossed them and the other one of each lasted for about 4 hours each that is slowly going away.
I actually did not buy them for the batteries, but bought them so I could get the chargers that they came with - so for me it was really no loss as they were really cheap - $6'ish dollars for one battery and charger - love the chargers! All 4 chargers and 4 cheap batteries for less then the price of 1 Samsung OEM battery. I then purchased True original Samsung OEM batteries on ebay for about approximately $12 each.
Each phone has 3 batteries, 1 in the phone and 2 ready to go batteries in their own respective chargers. I simply pop a new battery in every morning and hardly ever use the corded charger unless I need a quick bump, that is if you can call the Samsung inphone charging a quick bump
I just use the standard stock Samsung batteries and simply rotate them - it works best for me and stays at 100% in the phone for at least 30 to 45min depending on light use - unlike when I charge them in the phone, and when I unplug them they always drop immediately to 96% to 98% even when I try to bump charge which is a pain in the butt and hardly ever works. This has been a problem for me since PalmOS and was cured by simply using external chargers. The batteries in my testing also seem to last longer by at least a couple of hours that way for me.
My thinking is that the small electronics in the battery and the elctronics in the phone talk to each other during charging and they for safety will not overcharge the battery or overtax the charging system of the phone. Where as an external charger isn't talking to anything at all and will continue to charge to full capacity and possibly further which is I am sure harmful to the batteries if just left in for 4months or so as I can atest to this on external chargers on all my PalmOS product (my extended Seidio batteries developed a pregnant bulge when I left them in like that), which by the way had the same symptoms of dropping battery percentage after unplugging from in phone charger.
Bottom line, if you don't want to see your battery percentage drop after unplugging, quit fooling around with this time consuming bump charge dance and simply buy an external charger and you will have 100% for at least 30 to 45min depending on light use before dropping from 100% - example of light use for me was checking a few emails, doing a couple of text messages, and running Smartbench 2010 - my 100% freshly install battery lasted 32 minutes before it dropped to 98%
Note: I do not use any battery saving apps - I do not turn off wifi or gps, I have sync always on and any other sync they requires you input a time in between syncs I have set to 1 hour and I get at least 18 to 24 hours of use in the way I use my phone - so it will be hard to tell how much time you get per charge because we all use our phone differently.
External AC chargers are the BEST!
