Get your calculator ready if you don't believe us.
Since we switched from the tireless bricks of the early 2000s, to today’s power-thirsty mobile phones, you’ve no doubt clocked up a fair few hours plugged into the mains.
If your charging habits are anything like mine, hours aren’t an appropriate unit of measurement at all. We’re talking about all night, every night, since around 2007.
That sort of thoughtless charging ritual, you’re probably just as guilty of, can’t be good news for your electricity bill. How could it?
So, How Much Are We Talking?
After applying some simple maths to an iPhone 11, as an example (other iPhone models will be similar), it turns out that the cost of charging your device, for an entire year, comes to a grand total of… wait for it… 55p.
It’s a similar story if you have an Android, like the Samsung Galaxy S20 with its standard Samsung adaptive fast charger and USB-C cable for instance.
The Maths Checks Out
Don’t believe us? Here’s how we worked it out. Start with the cost of a kilowatt hour (kWh), which is an average of about 10p in the UK.
Then look at an iPhone 11, we know it comes with a 5W (0.005 kilowatts) charger that will juice the 3110 mAh battery up from empty to full, in about 3 hours.
So, multiply the 3 hour power time with the 5W charger, giving you a total of 15W. That’s the total amount of electricity your iPhone barely sips from the grid every time you replenish from 0% to 100%. Given that a kilowatt costs 10p, 15W will set you back a cool 0.15p. Not even close to a full penny.
Likewise, a Samsung Galaxy S20 Ultra 5G non-removable Li-Ion 5000 mAh battery will charge in just 57 minuets from 0% to full when using a super-fast 45W charger. Take the 57 minutes charge time multiplied with the 45W (0.045 kilowatts) fast charger output, you’ll take 42.75W of juice from the grid. Absorbing this mere 0.4275p from your bank balance.
Finally, if you do charge your iPhone 11 every night, extrapolate that 0.15p over 365 days, giving you a yearly bill of around 54.75p.
But wait for this. Charging your Android Samsung Galaxy S20 Ultra 5G over a whole year, your bill will come in at a massive £1.56. The outrage.