The keyboard isn't rechargeable. The batteries are and you can remove the batteries and replace them. The mouse's battery is internal and cannot be replaced by the user.
“Magic Keyboard, Magic Keyboard with Numeric Keypad, Magic Mouse 2, and Magic Trackpad 2 have a built-in rechargeable battery that lets you use the devices for extended periods between charges.
...
If you have an earlier Apple wireless mouse, keyboard, or trackpad with removable batteries, learn how to install batteries.”
Looks like the new ones have updated to an internal battery. Not sure why that's any different than the mouse. I'm just stating what was previously given as the reason for the port being on the bottom.
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The keyboard isn't rechargeable. The batteries are and you can remove the batteries and replace them. The mouse's battery is internal and cannot be replaced by the user.
https://support.apple.com/en-us/HT205160
“Magic Keyboard, Magic Keyboard with Numeric Keypad, Magic Mouse 2, and Magic Trackpad 2 have a built-in rechargeable battery that lets you use the devices for extended periods between charges.
...
If you have an earlier Apple wireless mouse, keyboard, or trackpad with removable batteries, learn how to install batteries.”
The two Magic Keyboard models don't appear to have user-replaceable batteries. I'm typing on one, and I don't see a case opening.
Looks like the new ones have updated to an internal battery. Not sure why that's any different than the mouse. I'm just stating what was previously given as the reason for the port being on the bottom.