Thanks woody, i can see the automatic and manual modes, and can work out how to set my type of batteries. i have a couple of questions though. my batteries are brand new 8.4v nimh 3300mah, 7 cell, and i want to prolong the life and get maximum performance from them.

1. i was planning to discharge them when they arrive in the post and do this every 2 weeks, should i just use the automatic setting for this?
2. also i was going to trickle charge them before an event how do i set it to trickle charge,and what amps?
3. and finally! at events i wanted to top them up inbetween fights, should i just use the automatic setting for this?

thanks for any help.