Ensure the cell's terminals are covered by the black insulation and replace the cover. We'll glue it back on when we're sure the cell is working.

Now reinstall the battery onto the RAID card and fire up the machine. If all has gone well, the RAID card will start charging the battery and after a few hours switch to "Fully Charged".

If after refreshing / recharging the battery the RAID utility still reports an error, first double check the voltage of the cell and consider trying steps 5/6 again. If this doesn't work the cell is beyond repair and will need to be replaced.