It's a good move, but that is not enough. My old Chinese phone had a replaceable battery but it lasted so long that after it died, it was not possible to find the replacement. It seems that all phones have batteries with different sizes, and potentially different third pin designation, so even if you find smaller battery, it still can be incompatible because of third pin.

So if you want phones to be usable for longer period, you need to standardize batteries.