Comment Watts (Power) is USELESS fort CAPACITY (Score 2) 193
Watts (volts x amps) is great for knowing how much POWER the battery can output (peak watts, constant watts - the size of the gasoline pipeline), but USELESS to know how big of a battery (how much gasoline/fule the tank holds) it is. mAh at the very least lets us calculate the battery capacity by multiplying the battery's voltage spec to get ENERGY (how much gasoline it holds). Ideally we'd know all of the above--ENERGY (in watt-hours, kilowatt-hous), CURRENT capacity (peak and safe max average amperage can be drawn) and POWER capacity (peak wattage, and average constant use wattage). Knowing some of these we can calcuate the others. But if we are ONLY given WATTS, there is ZERO WAY TO CALCULATE the battery CAPACITY. So I shall repeat:
WATTS IS USELESS FOR CAPACITY!