It is a second review, the first one I deleted.

It is a second review, the first one I deleted.
On 04/12/2018 I took a nexus 6p to change the battery, on the same day it was. When charging later, it never charged up to 100% at a time, it always stopped before, after factory reset, full battery downloads ... always. I told him about it and they told me to take it. A week later I went back, they looked at it and they changed my battery, because the same thing happened to them. In warranty. With the second battery, the same thing happens to me, use whatever charger and whatever cable, I went back to comment, they told me to take the chargers and cables there to look at it. There, with the reception loader, the same thing happened. They put it in a charger that they have inside, starting at 98%, they connected it up to 99%. Charged well, but only had 1% in that charger. They told me that it was not problematic, that nothing happened if I disconnected and reconnected the charger so many times until I reached 100. A battery could go wrong, okay, but two ... The truth, I do not think this situation is normal, I do not It seems an adequate way to charge the phone. There is something else that before changing the battery the first time it was not. I am not calm, your answer is that it does not matter to you, that nothing is going to happen. I do not trust that over time it will not harm you in something else. Why has it never happened since I have it, more than two years ago, until the battery was changed the first time and then it has not stopped happening any time? The battery should have stabilized if necessary. It has had full downloads and has been restored from the factory. Suspect, there is something that is not normal.
Poor quality battery? However compatible it may be, it will not be of the qualities they say they have. Did they spoil something by changing the battery the first time? I do not rule out anything.
It is still under warranty, give 6 months for batteries, but, seeing the situation, I will consult alternatives. A pity not to have the peace of mind that everything was as it was supposed to have been, I did not expect, sincerely.
Edito: According to the alternatives consulted, it is probably a poor quality battery, however compatible it may be. Most agree on this.
I wish I had not brought him there to change the battery.

I edit to answer: As I said, I took it a week after changing the battery the first time, changed it to be defective, according to them, and, with the second battery put by them, the same thing happens to me. I went back a week to change the first battery put by them (third time there), the same thing happened to me, and they told me that nothing happened, that I did not give importance to having to restart the necessary times until it was recorded complete to 100%. Passing the same with the two batteries put, it is clear that the batteries they have for this phone model, however compatible they are, they give problems, or that touching it the first time I wore it bothered something that has affected the load. Before carrying it, I carried it perfectly, always, after wearing it the first time, never. When I went the third time, in case it was not understood, the only thing they did was connect it to the reception charger for a while, until it was complete before it reached 100%, and then they put it in another charger for a few seconds, it continued loading, and they disconnected it before giving it time to happen again. They are the "checks" they did, nothing more. Trust in the site I can not have it, and taking into account the answer given, still less, given the situation that have caused me. Why would a third battery be different? Do you have more than one battery model for this phone model? They will not make me come back to find me, hopefully, after the same situation, I would have to make the phone worse than the battery, and in that case, if the time came, I would consider where to take it.