Do you have a few Vibrant,Captivate,Mesmerize Batteries? Do u need a back up battery? Vibrant,Captivate,Mesmerize Batteries will power on the Galaxy S2. The phone will charge the GalaxyS T959 batteries with the phone turned off, not on. To make the batteries work all you need is a cigarette butt(clean one if u can). put the cigarette butt in the bottom of the battery slot, then take the battery. Put the battery bottom in first, that will be the side with out the directional triangle. You will compress the cigarette butt with the battery and push down the top of the battery gently down. Dont go all crazy and slam it in and mess up the pins.
To remove battery , just pulll out the cigarette butt and remove battery
At this point, many of you will ask questions like... well the galaxy S2 T989 has 4 pins and the Vibrant,Captivate,Mesmerize are 3 pin.
this does not matter, this will still work. regardless of the charging pin count
i hope this may help people