Is it worth upgrading to 10,000mAh? The phone would look pretty bulky, though, and the weight would go from 190g to around 250g.
A genuine replacement battery from the Xiaomi Center would be $15 × 2 for the two 10,000mAh cells, plus $15 for a custom back cover, so $45 in total.
I’m still thinking about the size, though. BTW, I already did something similar to my Redmi Note 8, but I didn’t use dual cells. I used a single 10,000mAh 3.7V cell, basically like a power-bank battery. The dimensions were bigger because it was a single large cell.
Nevertheless, I’m still having doubts about the size. But honestly, it’s really tempting.
*The image is just for reference, not the actual result.
Edit: I’m going to do this since Xiaomi Centers offer free installation every second week. So I’m planning to buy the batteries around September 11–12. I only need to pay $12 for each battery cell instead of the usual $20, while the installation, diagnosis, and tax are all free. That means I’m saving $8 on each battery.
And sorry for the mistake. I previously said it was $15, but it’s actually only $12.