Quote Originally Posted by Max
Hi,
1) what rate can I charge a 12v Nicd 2200mah or 2400mah battery?
Depends on the quality of the pack. but 0.5C (1.1 or 1.2A) seems safe enough.
2) can I charge 2 of said battery in parallel so I can change both batteries at once between fights?
Preferably not. Also, with the pricetag of a charger these days, why bother?

3) if I've got a 11.4 4000mah 25c lipo battery don you think I should use a 100A fuse or a 80A fuse (I'm using 2 drill motors and speed 900 replica)
Thanks :P
4000mAh * 25= 100 000 mAh= 100A. That is what the rules say, so it seems good enough for me. Also, it would surprise me that the LiPo pack has a burst of 25C.