I usually have extra pre charged batteries, or just fly another plane while the charger does its auto thing. I found myself wondering what in the heck are the fast charge rates on some of my packs if I need to know.

A week ago one of my buddies borrowed my charger and had his battery ready in about 10-15 minutes. I use the auto rate on the triton and it takes a while. I will watch the guys fly or fly one of my other planes (trainer) if I am out of pre charged packs.

Is there a general rule for fast charging nicd and nimh you guys use ?
Just for example, nimh 4.8 volt 1500mAh what rate would you charge this at the field ? Or this one nicd 9.6v 600mAh 8 cell ?

I guess what I am asking is there a formula to find the fast charge rate for a battery ?