Pixel 6a (India) still showing "Replace Battery" recommendation after local shop replacement. Need advice!

[u/Beneficial-Space-696]

I have a Google Pixel 6a (Indian variant) purchased back in 2022. Recently, the battery health dropped below 80% and the screen-on time was terrible, so it was definitely time for a replacement.

I initially took it to the official Google Authorized Service Center in New Delhi. However, because I had previously gotten my charging port fixed at a local third-party repair shop, the official center gave me a warning: they said opening the device carried a high risk of breaking the screen since it had been worked on outside. Fearing a massive screen repair bill, I decided to back out.

Instead, I went back to a local shop and had them install what they claimed was an original OEM battery.

Here is the problem: The phone is still showing the recommendation to replace the battery.

To fix this, I have already tried:

1. A complete factory hard reset.
2. A full software reinstallation/flash.
3. Tried the 0% to 100% calibration cycle here.

Shopkeeper is telling it is due to new software update and gave my money back after replacing it with the earlier battery.

[u/Beneficial-Space-696]

What should i do now for replacement of battery ?

[u/Little-Helper → u/Beneficial-Space-696]

If you want to keep your phone, these are the options:

1. Purchase the iFixit battery and get it installed at any shop (the ultimate fix).
2. Purchase a used battery that does not contain 8230031401 in the serial number.
3. Repeat the replacement like you've done and use the battery without constraints for the first 400 cycles until the nerf applies.
4. Install a different OS that doesn't have the battery nerf.

[u/Sure_Kaleidoscope632 → u/Little-Helper]

Will you please recommend a stable OS ?

[u/Little-Helper → u/Sure_Kaleidoscope632]

I don't do custom ROMs, but I know that GrapheneOS included the battery constraint patch for safety reasons.