I to am having this problem on 2 Dell PE2950's with the PERC 6e battery showing degraded in Open Manage . Both machines are at most recent BIOS 2.70 and PERC 6e firmware level 6.3.3. I have gone as far as replacing the entire chassis except the HDD's, so hardware wise nothing else to be changed. I don't see how this can be OS problem. Firmware is the only thing left.
Any ideas?