Charging Questions...

[thndrckn]

I am trying to help a few kids in the neighborhood get in to RC and I am having a hard time explaining how to charge various packs for their cars is there some simple way to explain what settings to charge what types of packs? right now all they have are Nicd and Nimh packs. ranging from 1100 to 3800 or 4200 mah,

Im not up on all the charging stuff since im mostly a nitro guy and I just have to charge my rx pack.

any help is is greatly welcomed..