Do you have an older laptop that has a dead battery? Probably buying a new battery will be expensive so you might want to try this really helpful video tutorial on how to replace the AA li-Ion Batteries inside the battery of your laptop. Make sure you follow the video properly and cautiously! Good luck. A link has been provided for a compatible, Sanyo Eneloop 8 Pack AA NiMH Pre-Charged Rechargeable Batteries
I really like the screens on the sony laptops but to be honest the price is the thing that shys me away from buying them. I tend to stick with Hewlet Packard now!