I think the key is that "ma" and "mah" are measuring different things. The first is a flow rate, and the other is a sum over time.
As for the 14.8 / 16.8v thing - that's the "nominal" versus maximum voltage of the battery. It's why we often refer to systems as 2S or 3S (or more), because it...
Your math is generally correct, but I believe there may be an underlying misconception about "mah" and how current works. "mah" stands for milliamp-hours - it's a measure of capacity against time. Current is measured in Amps, abbreviated "A", and milliamps are 1/1000th of an amp.
Voltage is...