Any Optimus F5 P875 user?

[orisus]

Hi friends, I got my Optimus F5 P875 last year and I was wondering if there is any battery ( not cheap Ebay battery) that last a little longer, just to have in case of long power outages. My friend choose a slim extended battery made by mpj for his Note 3. Battery for P875 is also available tho, anyone already used this battery? Good or bad?? Thanks in advance for your help.