I have a Toshiba Satellite A665 with Windows 7 Home Premium. I recently bought a new 12 cell Lithium Ion battery (not a Toshiba one, but a cheaper one). I think the one that came with my laptop was a 6 cell? I charged it in the laptop plugged in for 24 hours. I unplugged the laptop and the battery only lasted about an hour. Plugged it in, battery would only charge to 45%. Sometimes it would say not charging even when plugged in. I contacted the seller and they told me to go to Toshiba website and download and install update my bios because of the new cell in battery. They also said to calibrate my battery, to charge and discharge it twice. They said the 12 cell battery is bigger than a 6 cell, so if need be they can replace it with a 6 cell. Does this mean a 12 cell won't work in my laptop? My computer checks for updates automatically. I am afraid to mess with the bios. I am not very tech savvy and don't want to ruin my computer. What to do? Thanks for your help.