It was inside the Redmi 1s I bought. It has the same dimensions. But I find no trace on the internet about this BM44 battery model, so it is not from another Xiaomi model. (??)
Hi guys, now it's my turn!
I got a Redmi 1S from aliexpress and the battery is this BM44 2200mAh.
Since the original battery is a BM41 2000mAh, this should be 100% fake. Is it??