Replacement Batteries

domubpkm

In your opinion, what are the best (autonomy, staying power) replacement batteries available (brands, references, vendors) for the different UT phones ?

BQ E4.5
BQ E5 HD
NEXUS 5
OPO.......

I think it would be good to gather the information here with, if possible, some internet links.
Thank you.

Keneda

For MX4, genuine ones (Sony US525569H4, A.K.A. Meizu BT40) for sure.

rocket2nfinity

For Nexus 5 PolarCell.

I've put a lot of work into it, and other than doing the Nexus 5X battery mod, no battery works better.