JB,
Not to worry on the "disconnect" deal; all here whom have done the batt.
swap, have seldom if ever, reported losing "stuff/settings." I'm an elec.
idiot and all my stuff came back on, inc. time, stations, etc. I wouldn't
give it a 2nd thought and using an interim source is not the deal, imo.

The undertrunk lid space was only opened once a year for the past 6 years,
to check the spare tire press. and make sure the batt was green eyed and
full. I really think my oem batt could have gone another year, but worth
the "do" on my schedule, not the batt's, lol! I see your X is an '00; I'd
do the new batt, if it were mine, especially in those YYZ winters.
GL,mD