On the road again

I'm off this morning to Cape Girardeau, Mo., and GrassRoots BMW Motorcycles to get a new battery for my '03 K1200GT. It's one of the new (in 2003, anyway) gel batteries and has performed well for the past five years. However, when I tried to start the bike Sunday afternoon after about four weeks of idleness, the battery was too weak to fire the engine. I put it on the trickle charger and within a day it was registering as fully charged. Nevertheless, I know that batteries can fail at inopportune times and I'm loathe to head for the West in a couple of weeks with a five-year-old battery that may or may not be good.
It's 145 miles to GrassRoots, so I'd better get moving.