RE: How to do math to figure out 1C?
G'day Mate,
You are correct.
It's really simple, 1C is the Capacity of the battery pack, ie, 1C of an 1800Ma pack is 1800Ma, or 1.8 amps, & so on. That figure is used for CHARGING.
2C would be 2x1800 = 3600Ma, or 3.6 Amps & so on.
There are 1000Ma in an amp.
The figures you quoted 180Mah, 20C, the 20C is for DISCHARGING, so that means you can get, 20x180 = 3600Mah or 3.6 Amps out of that battery, until it's flat.
Cheers