I used to charge my earlier battery for "1hr 45min" to charge fully(10% to 100%). That battery which came with the new laptop had a life of 2.5 years. Then I replaced it with brand new battery manufactured by TOSHIBA itself...and I have been using it for the past 45 days....and even until this day it takes around "4hr 30min" to charge fully......My model is TOSHIBA satellite C-640 X-4010...brought back in august 2011....