Hello. My laptop's battery is 4400mah, i bought it in October but, I haven't used it more than 20 times since then. I am using my laptop with the battery removed from it. The problem is that it only lasts about 20-25 minutes. When I bought it, it used to last for 3 hours, but now it drains really fast, and also when I charge it only needs 25-30 minutes to fully charge. Anything I can do about it?