How to calculate according to the battery voltage and capacity batteries series and quantity and relationship

Single section 18650 lithium batteries generally 3.6 3.7 V, general is 2000-2400 mah capacity (new 18650 and 2600 mah, but high prices generally don't use).

We to a 10.8 V 8800 mah battery, using the single section 18650 of the voltage is 3.6 V, capacity is 2200 mah to calculate.

According to the circuit and close relationship, the series circuit, current constant voltage increases, so the voltage to calculate, 10.8/3.6 = 3, can infer is made of three groups of 3.6 V batteries together;Parallel circuit voltage constant current is added, so from a capacity to calculate, 8800/2200 = 4, can be concluded that the section 4 of a group of 2200 mah batteries and battery pack, number of batteries for 3 * 4 = 12, this is to use 12 18650 a battery of lithium batteries.