Although the battery's production date was in 2020, unfortunately, after 6 months, it developed a battery swelling issue, especially during the winter months.

I have it for less than a week, it feels like I haven't even changed the battery. It struggles to last a day with data, WiFi, and Bluetooth turned off.

After approximately 1 month, instead of charging, it discharges and if at some point it starts charging, it may take 2 days for a full charge (with the phone turned off)

The capacity of the old one had decreased. I ordered for the Xiaomi Redmi Note 4 and the one I received was for a different model.

Although I changed the battery that was draining like crazy, I didn't see any significant improvement even with the new battery.

The same terrible quality as the factory one.
We are talking about the redmi note 4 mediatek version with 3GB RAM and 64GB ROM.
Overall, whoever bought this particular model with the helio x20 was simply a complete failure, as mediatek, after the failure of the x20, had announced a withdrawal for a considerable period of time and no company trusted it to supply their devices with mediatek for a year. I have been working with phones with an mt processor my whole life and they all burn out.

It doesn't last at all, it barely lasts half a day. From mine that lasted 2 hours, okay, it's a good phase until you gather money for a new phone

It's not worth getting a battery (the one I tried) because the difference is simply too small at the beginning and within a month it becomes like the old one.

I changed the battery in my phone and I don't see any difference. It continues to drain quickly even without using the phone. It's not worth it. It's better to get a new phone instead of the battery

The capacity of the old one had dropped to 3000mAh and I thought of getting a new one because I use it constantly and with a new battery, the phone would last a whole day with internet and gaming, while now I had to charge it during the day.
As soon as I got the new one and did some full charges to reach its maximum, I was disappointed because both with a program on the phone and with a USB meter, it showed me 3000mAh, while according to the indications on the battery, it said 4000-4100mAh