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The step from the batteries used today, and separate batteries isn't very big.
Iphone or whatever other device can easily be remade with removable batteries.
I just wished they would put a standard on those batteries. There are so many types and forms, even though most electronic devices can run on 3,7V, 2000mAh batteries perfectly fine..
If you ever visited a battery shop (even if online), you can see that certain batteries with the same name, but different supplier,can still be totally different in shape, size, and power..
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