how long do you charge a 4s battery with 3300 on 3.3 amps

To find the charging time of a battery, you need to divide the battery capacity by the charging rate.

In this case, a 4S (4-cell) battery with a capacity of 3300mAh (or 3.3Ah) is being charged at a rate of 3.3A.

Therefore, the charging time can be calculated as:

Charging time = Battery capacity / Charging rate
Charging time = 3.3Ah / 3.3A

The units for current (A) and capacity (Ah) cancel each other out, leaving you with the result in hours:

Charging time = 1 hour

So, it would take approximately 1 hour to fully charge a 4S battery with a capacity of 3300mAh at a charging rate of 3.3A.