I recently installed Rockbox on my 6G as per the instructions here:
https://www.rockbox.org/wiki/IpodClassicPortI am having an issue where heavy disk read operations (initializing and/or updating the database) drain the battery to the point where the device is forced to power down before the operation finishes. I should note that this iPod was in well working order before I switched to Rockbox, and the battery is just fine during normal use as well.
Any suggestions?