I'm planning on installing a tender when I get home tonight. My question is, other than maybe the clock being rest, is there anything thing I need to be concerned with when I disconnect the battery?
A few things are highly suggested....
If your battery is 3 or more years old, consider a replacement within the next year.
When you remove the connections, remove the battery, and abrasivly clean the contact points on both terminals with sand paper, also do the same thing to the cable ends, and also remove both ground wires where they attach to the frame, next to the battery, and clean them also....
If the battery is already low, and not at full charge, charge it on a real, manual battery charger at a 2 amp rate, untill it is fully charged.
Then install everything, and use the tender as a maintainer charger.
A tender will not fully charge a batt that has been sitting and is drained, it will only offer a surface charge, not a deep cycle charge.
Also note, a tender placed on a batt that has not had the terminals and connections cleaned, will also not correctly charge or maintain, as an invisible resistive coating may have formed during the past few monthes. And a tender will not "revive" a dead batt either, that really requires a good charger.
Running a maintainer is good, but the other areas I have addressed insure it actually works, and when left on a maintainer for many months, a resistive connection will still occur, its just a basic fact of the charging/discharging cycle.
Best of luck,