I needed a new battery for my thinkpad x230 and decided to buy a replacement battery from Aliexpress. There're rumors that cheap Chinese batteries will not last nearly as long as the original ones but I decided to give it a try.
After I received my battery I did a couple of cycles and checked it's capacity:
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But I really want to know what cells are installed inside. So, I pealed off a sticker to see the cells, unfortunately there's only a tiny hole under the sticker:
The seller didn't give me a clear answer what model of cells is installed. But those green cells with black stripes looks very similar to ncr18650a
And they are 4.2v rated
But the controller inside the battery charges them to 4.3v. Which will decrease lifespan of the battery.
When I disassembled the original battery the cells inside were Sanyo UR18650ZT which are 4.3v rated
I'm not 100% sure that 4.2v rated cells are installed in the battery that charges them to 4.3v but if this is the case that might explain why those Chinese batteries notorious for having shorter lifespan.