How do any of us know if there isn't any other differences in these Apple trackpad and mice versions?
I can't use the MM2 or MTP2 with my 2009 and 2010 iMacs.
I can ONLY use the older 2009 1st versions of these Apple input devices.
So, something had to change between the technology in these Apple version 1 and 2 input devices other than just a battery design change.
I think one of the changes with the MM2 and MTP 2 is its compatibilty with only Bluetooth 4.0 compatible devices.
Older iPads and older Macs use an older Bluetooth spec.
Maybe some other differences between the version 1 and 2 model input devices, as well.
There's gotta be some other internal technology changes to explain why these newer MM2 and MTP2 devices fail to work with older Macs and why Apple is NOT fully supporting the MM1 and MTP1 on iOS/iPadOS.