Imagine you are a manufacturer of the kind of device that still uses removable batteries. Installing a cavity in the device to receive batteries is always the cheapest option, which means you can sell your product as cheaply as possible. A consumer can use rechargeable, removable batteries if they wish, that’s not your problem. If you wanted to put in a permanent rechargeable battery that requires wires and transformers and those need to be regionally specific, it’s just cost on cost on cost. So if you’re selling a device that’s cheap, like a flashlight or toy, removable batteries are the way to go. Something more expensive like a cell phone or radio will go the wires and transformers route.
For consumer it boils down to cost and convenience. There is no reason why all removable AA, AAA, C, D, etc. batteries can’t be rechargeable. It’s just the single use are cheaper and people are cost conscious / lazy.
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