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# Power of the chargers

The product description of the chargers indicates the number of cells, the charging current and the wattage of the charger What do wattage and charging current mean in practice?

Here are a few examples:

1S LiPo = 4.2V

2S LiPo= 8.4V

3S LiPo= 12.6V

4S LiPo= 16.8V

5S LiPo= 21V

6S LiPo= 25.2V

The 2S 500mAh battery used in the indoor aircraft is charged with 1C (0.5A) current

The calculation formula is as follows:

Watt= 2S x 1C = (8.4V) x (0.5A) = 4.2W

The power required by the charger is 4.2W If you want to charge the same battery with 2C (1A) power, the calculation formula is as follows:

Watt= 2S x 2C = (8.4V) x (1A) = 8.4W

The power required by the charger is 8.4W

EasyStar 3 used 3S-2200mAh LiPo battery charged with 1C (2.2A) power.

Watt= 3S x 1C = (12.6V) x (2.2A) = 27.7W

Power required by the charger 27.7W If you want to charge the same battery with 2C power:

Watt= 3S x 2C = (12.6V) x (4.4A) = 55.44W

Power required by the charger 55.44W

Switching to larger batteries requires more power.

Take the 6S 4000mAh LiPo I use in my own EDF as an example

The battery is charged with 1C power:

Watt= 6S x 1C = (25.2V) x (4.0A) = 100.8W

Power required by the charger 100.8W If you want to charge with 2C power then:

Watti= 6S x 2C = (25.2V) x (8.0A) = 201.6W

In this case, the power of the charger must already be 200W.

Before buying a charger, you should think about the size of the batteries you use now and in the future. If you need help choosing a suitable charger, I will be happy to help.

Safe charging

Best Regards.

Ville