to be honest, i would never upgrade if it is not costs a funny money. but i guess its because of a small capacity at all, and old enough model of laptop so there are a lot any kind of details.
so on your choice, anyway, don’t forget to check out if battery model you are going to buy is compatible and and usable as replacement of yours. it depends on power or voltages or something like that - I'm not good at it, but you'll find the necessary values on the battery
gl
