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Rechargeable batteries electricity cost

A rechargeable battery charger’s power, usage, and cost are very low.

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

Rechargeable batteries

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

Electricity usage of a battery charger

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

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

5,1 W / 1000 = 0,0051 kWh

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

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

Because it takes 6 hours to recharge the charger, we will pay 0,0066 euros 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, look at this YouTube video we have prepared for you.

Plug in power meter

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

plug in power meter

Our house appliances and devices like the washing machine, the dishwasher, the TV, or the printer are plugged into 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 time.

Electricity calculator

If you cannot get a plug-in power meter but 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 time.

You 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 euros (or dollars or pounds) to your electricity provider per every kWh you consume 

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

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

Electricity measurement units

Not everybody 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 at this YouTube video that we have prepared about this topic.

What is a Kilowatt hour (kWh)

Also, you can have a look at 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 into other units

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

Watt (W)
Watt (W) wattage calculator
Kilowatt (kW)
Kilowatt (kW) calculator
Kilowatt hour (kWh)
Kilowatt hour (kWh) calculator
Power, voltage, current
Power, voltage, current calculator

Are disposable batteries better for the environment?

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

Is it easier to replace an exhausted battery with a new one and keep it in 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 an environmental impact so in this post we analyze if it is worth using 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 for your energy bills. 

And it also benefits the environment because conserving electricity prevents unnecessary waste of natural resources.

At the individual level, it may not look worth trying to save a few watts here or there. 

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


For example, if 9000 households save as little as 10 Watts per day (0,01 kWh), that would save 32850 Kilowatt hours (kWh) annually. 

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 euros (or dollars, pounds, or any other currency) per kWh, we would collectively save nearly 6000 euros annually.

> 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.

Look at this page for more information about the resources needed to produce electricity.

In any case, small energy savings do count when looking into the bigger picture.

Proven ways to save electricity at home

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

How to save electricity at home
How to save
How to save
How to earn
How to earn


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