It was completely empty when I received. I did a full charge but the first days of use, it took four hours in the day and doing nothing with the phone. therefore produces NUL.
Then I read on the internet that it had the battery gauge. The procedure is as follows:
Charge the battery until the phone says 100% responsible and allow 2 hours. (Attention load in one go without disconnecting the phone during charging)
then use the phone until it is completely empty (Once the phone goes out of himself, to wait several more hours 6 hours is good)
Once completely empty, recharge the phone again to 100% (still a load in one go, by loading two hours more than 100%)
That's it, the battery is calibrated.
I did the manipulation, saying that if it did not work, I was going to fire her.
But the result is staggering.
The first 3 days, with the phone turned on and without making anything special with the phone, the battery was empty after 4 hours while loading all night.
I did the last HANDLING -> today, after 4 hours of use, the battery is still 98%.
We will see in the long run if it takes but in any case, her performance today have nothing to do with those of the preceding days.
When calibration is done, you can charge the battery normally (This is when you want)
I saw that it was advisable to do a calibration once a month.
So before saying that the battery is zero, try CALIBRATION, CALIBRATION before returning.
I put only 4 stars because to see in the long term if it holds up well.
SEEMS THEREFORE BE A VERY GOOD PRODUCT