Just another successful 3GS battery replacement
20 - 30 minutos
My 3GS battery life had gotten comically short -- it was routinely cutting off at 99% or even 100%, according to the onboard charge estimator. Was effectively about 5 minutes of working time while unplugged.
Process went *exactly* as specified in the guide published on this site. No surprises, pretty vanilla. Just the way I like it!
Take it easy, don't rush, trust the guide -- it works well if followed precisely. Good luck!