🚀 go-pugleaf

I'd like to get some C size nickel metal hydride batteries for an r/c car
and some AA size batteries for other purposes.  Can anyone suggest where
I can get these and what they should cost?

I'd like to get the C size cells preassembled into battery packs of 7 cells
(=8.4v).  If they're not available this way I thought I'd solder them together.
Are there any special problems in doing this?

Also, I'd like a fast ac, dc, or ac/dc charger, so anything you've got on
that would be helpful.

Thanks in advance....