[sjs01]

I think that what you should do, is download the ROM you want, open the archive probably using 7zip, then find the "RUU_SIGNED" in it, then move it to the root of the SD Card, then once you get it on there, rename the file to "RHODIMG". Then once you get your friends battery put it in and then hold the volume down key, and then press the power key and if it's done right you'll get a bootloader screen then you can flash from there. It just sounds like your battery is dead and can't charge a different battery should fix it.