Dell Inspiron 3437 Battery Issue

My Dell has been acting up pretty recently (6 months old and still under warranty), and the battery does not charge past 80%. Once it get's near the 80% charge, it immediately fills up to 100%.

I've remembered using the laptop for more than 6 hours under moderate use but now it barely lasts 2 hours.

Please give me some advice because I'm really dependent on this laptop.
 
A

Artur65

You have 6 or 8 cells battery. If 6 it's normall. Should work about 2-max 3 hours when new. On 8 cells could work till 5 h.
Producers give only 6 months of warranty on bateries