The later Tiles did have replaceable batteries. But they did still suck at being located when lost. Once I tried marking my tile as lost and carried it with me

The later Tiles did have replaceable batteries. But they did still suck at being located when lost. Once I tried marking my tile as lost and carried it with me in Barcelona including on busy subways and it took 1 month to get a ping :) They just didn't have the reach that Apple has, by far.