The power, electricity usage and electricity cost of a rechargeable batteries charger is very low.

Still, if you want to save some electricity, there are some tips and advice that may be of your interest.

On this page you will learn:

> Electricity used to charge rechargeable batteries

How to calculate the electricity cost of charging batteries

> Electricity measurement units: Watt, Kilowatt or Kilowatt hour

> Are disposable batteries better for the environment?

> What is energy conservation and how does it benefit you and the environment

Alternatively, you may want to fast forward to the batteries charger electricity cost calculator.

Rechargeable batteries

A plug in power meter it is the most reliable way to measure the power, electricity usage and the electricity cost of a battery charger.

Electricity usage of a battery charger

According to our plug in power meter, our battery charger is continuously using 5,1 Watts (W) while charging four A++ batteries.

That means that the electricity charger is consuming 0,0051 Kilowatt hours (kWh) per hour. 

5,1 W / 1000 = 0,0051 kWh

Given that we are paying to our electricity provider 0,217 euro per Kilowatt hour (kWh) we consume, to recharge the four A++ batteries we need to pay 0,0011 euro per hour.

0,0051 kWh x 0,217 euro per kWh = 0,0011 euro per hour

Because it takes to the charger 6 hours to recharge the batteries, we will be paying a total of 0,0066 euro to recharge our four A++ batteries.

0,0011 euro per hour x 6 hours = 0,0066 euro

If you would also like to use a plug in power meter to measure the electricity consumption of your battery charger or any other device at home, have a look to this video we have prepared for you.

A plug in power meter displaying the power usage of a device

Additionally, clicking on the image below it will redirect you to the Amazon page where you can have a look to the specifications of the power meter we use for our measurements.

All of our house appliances and devices like the washing machine, the dishwasher, the TV or the printer are plugged to a wall socket. 

So, with a power consumption meter we can determine how much electricity our appliances or devices are using and, more importantly, we can measure the electricity usage over a period of time.

Electricity calculator

If you cannot get a plug in power meter but you know the power consumption and the electricity cost of a battery charger, the calculator below can be used to estimate the electricity usage and the electricity cost of a device over a period of time.

You just need to adjust the values in the PARAMETERS section to your requirements and the calculator will automatically display the RESULTS section.


For example:

>  If your battery charger has a power rating of 13 Watts

>  If your battery charger needs 6 hours to recharge the batteries

>  If you need to recharge batteries 50 times per year

>  If you are paying 0,2 euro (or dollars or pounds) to your electricity provider per every kWh you consume 

Recharging batteries it will cost you 0,78 euro (or dollars, or pounds, or…) per year.

A few other examples from our Electricity usage calculators page that may be of your interest:

Fridge electricity usage calculator icon
Freezer electricity usage calculator icon
Microwave electricity usage calculator icon
Iron electricity usage calculator icon

Electricity measurement units

Not everybody it is familiar with terms like Watts (W), Kilowatts (kW) or Kilowatt hours (kWh) so if you would like to learn more about them, have a look to this video that we have prepared about this topic.

What is a Kilowatt hour (kWh)

Also, you can have a look to our electricity measurement units calculators to get a better understanding of:

> What is a Watt (W) and how to transform Watts into Kilowatts

> What is a Kilowatt (kW) and how to transform Kilowatts into Kilowatts hour

> What is a Kilowatt hour (kWh) and how to transform Kilowatts hours to other units

> What are Power (P), Voltage (V) and Current (I)

Watt (W)
Kilowatt (kW)
Kilowatt hour (kWh)
Kilowatt hour
Power, voltage, current
Power, Voltage, Current

Are disposable batteries better for the environment?

Is it really worth the trouble of buying a battery charger and charge our batteries every time they run out of power?

Is it not way easier to replace an already exhausted battery for a new one and just keep that exhausted battery on a box until you have time to take it to a collection spot?

A battery charger loaded with rechargeable batteries and surrounded by many disposable batteries

Well, disposable batteries may have both an economic and a environmental impact so on this post we analyze if it is worth to use rechargeable batteries

Energy conservation

Energy conservation can be defined as the decision and the act of using less energy 

Energy conservation both benefit you and the environment

The act of saving and conserving electricity does benefit you because you will be paying less on your energy bills. 

And it also does benefit the environment because conserving electricity prevents any unnecessary waste of natural resources.

Now, at individual level it may not look worth to try to save a few watts here or there. 

Still, every little counts and if hundreds or thousands of us do save a little every time, it will make an important contribution towards conserving our natural resources.


For example, if 9000 households would manage to save as little as 10 Watts per day (0,01 kWh) that would add to 32850 Kilowatt hour (kWh) saved per year. 

9000 households x 0,01 kWh per day x 365 days per year 

32,850 kWh saved per year

That is a considerable amount of electricity, but let’s add additional perspectives for clarity:

> Assuming an average cost of 0,18 euro (or dollars, or pounds, or any other currency) per kWh, we would collectively be saving nearly 6000 euro per year.

> To produce 32,850 kWh of electricity it is necessary to use around 17 metric tons of coal or 56 barrels of residual fuel oil.

Have a look to this page for more information about the amount of resources needed to produce electricity.

In any case it is clear that small energy savings do really count when looking into the bigger picture.

If you are looking for ideas to save electricity at home, have a look to this YouTube video were we show some useful tips to reduce the electricity usage at home and how to decrease your electricity bill. 

Two pie charts showing what home appliances and devices are using the most electricity at home.

We hope that you have found the information on this page informative and of value. 

If so, please consider to share or subscribe to our newsletter.

We dedicate a considerable amount of time and effort to create content and your support and engagement will encourage us to keep moving forward.

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