StorageTek 2530 battery replacement causes server reboot?

Today I replaced a battery on a StorageTek 2530 controller. It's one of two, and the Sun Service advisor mentioned nothing about panics or reboots...but the CentOS 5 machine (using the Sun RDAC drivers) attached to it rebooted anyhow. Don't worry, it's only in production....Fortunately it's one of two database servers, and the other one took up the load just fine. I'm not sure if I bumped a power cable (always possible), or if the machine panicked, but I was unable to find anything in the logs so I really don't know what to think.

I'm going to be replacing the battery on another one in shortly, so I'll get to see what happens then. At least I'll know to schedule downtime...