In the end, shutting down the array, re-seating the battery, then restarting, appears to have resolved the issue. It's been approximately 18 hours and no further errors.
The first go 'round the battery sat for 4-5 months before I had time to change it, but within a few hours MDSM started reporting that it failed. We assumed that it was because of the time it sat idle. This time I installed the new battery the day after it arrived and, about 10 hours later it had failed. I looked through the logs and it was reported that the battery was fully charged within a couple of hours,only to fail 8 hours later. The RAID Controllers are at the same firmware level, 7.35.39.64, which looks like the latest/last firmware version. Is it possible that we've been sent two defective batteries? Any other ideas? Any assistance is greatly appreciated.
MD3000i RAID Controller battery replaced, twice, still reporting failed