Thanks to someone else pointing out a link to info (which I could not find before and apparently neither have many others) I am posting direct links here for folks to find the information easier. I still think this info should be readily & easily available as Lead is DEAD thanks to the crashing costs of LiFePo4 battery cells.
CLASSIC - LITHIUM Quick Start
http://www.midniteftp.com/support/kb/faq.php?id=121
CLASSIC - LITHIUM - How do I set the Classic to charge Lithium batteries (explained)?
http://www.midniteftp.com/support/kb/faq.php?id=75
How do I set the KID to charge Lithium batteries?
http://www.midniteftp.com/support/kb/faq.php?id=87