Hi there! Do you think you can refill my dell inspiron 1440 Li-ion battery? With fully charged, it can only lasts about 5 minutes.

Battery type: K450N
Capacity: 48Wh
Rating 10.8V

And can you explain to me in super super simplify way how this works and how long the new battery will last? Thank you sooo much! You can PM me if you want btw. TQ!