Several have asked me - most who are not familiar with it yet - and believe they want the key-switch connected for a back-up.
I discourage it for the reasons stated, however IF anyone feels strongly enough about really wanting to do that, then I could provide a 1:2 adapter so both could be connected simultaneously.
A much cheaper (and better IMO) option is just to buy a replacement battery and tape it under the seat!
Or as suggested, simply replace it once a year when you change your CO/Fire detector batteries in the house (everyone DOES do that each year, right?)