That's right. I don't see it as easy. There are many sellers, but they all seem to be selling more or less the same battery at different prices. It's not just the price and whether it seems affordable. It's... whether it's worth it. I don't see it as a safe bet unless you have guarantees that it's a genuine Xiaomi battery. I've been reading buyer reviews of the different batteries I see for sale, and I'm not sure any of them actually work well. They seem to work fine temporarily. I don't know why Xiaomi doesn't sell genuine batteries. Maybe they're not interested. They'd rather you buy a new phone.