Personally this is the one I use. It does all types of batts plus has a ten batt memory. It has peak charge, discharge and cycle options and is fully configurable. It does take a little getting used to but it is sweet. Oh yea it will do both 12V and 120V. You do have to purchase the charging cables seperately.

The only problem for me with it is that I like it so much that I want to use it on all my planes but I can only to 1 gas powered plane at a time of 2 glow powered planes. Now if it could only to 5 batts at a time. [X(][X(]

It is expensive but works well

http://www2.towerhobbies.com/cgi-bin...&I=LXEYD4&P=ML

The one Ken suggested is the baby brother to the one I list and every bit as good.