Purchasing an iPhone 6 will set you back anywhere from $200 to $650, depending on which model you buy and whether you’re due for an upgrade. But after you’ve settled that bill, you will only pay $0.47 a year to charge it, according to a new study from Outlier.
The study measured how much energy it takes to charge the Apple device, about 10.5 watt hours of electricity, and estimated that the average phone-owner would charge up once each day. While the Plus takes more energy to charge, it has a longer battery life and needs to be charged less frequently.
A laptop requires about 14 times the electricity used by and iPhone 6, according to the study.