The new battery in lumia holds less than the old one, why?

Question

Microsoft

I bought a battery on eBay, they write that it is brand new.
I put it in 920 lumia (there was a battery in 2012, the phone itself was from February).
The charge melts right before your eyes. Very fast. Even the old battery calmly holds up to two days when not in use.
On the new hours for 5 phone work, games for 15-20 minutes and video recording - about 40-45% is gone.
Actually,
1. The piece of iron somehow adapted to the old battery, you need to reset something.
2. Acc is bad.
Can anyone give me some advice or know from experience?
I changed the battery myself according to the manual from Nokia, plus then I watched the video on the internet.

Answer 1

it looks like someone tried it and left it out of work for a long time.
Try to do 3-4 workouts:
Full charge - full discharge. Moreover, the discharge guide will not be an indicator on the screen, but the automatic shutdown of the phone.

Answer 2

Do they differ in weight and markings? Perhaps there is a small battery and a weight inside.