Portable battery chargers are essential for making sure your devices never run out of power while you’re on the road. Choosing the right battery charger can be tricky. You want something easily portable and inexpensive, but it needs to have enough power for your device.
A battery’s capacity is measured in milliamperes (mAh). ). For example, a Samsung Galaxy S5 comes with a 2,800mAh battery, while the iPhone 6 relies on a 1,810mAh cell. A charger with a smaller battery can help when your phone’s internal battery gets low, but you will need a charger with an mAh equal to or greater than your phone to charge it to full power from a drained state. Tablets and laptops consume much more power. Portable battery chargers also lose some (as much as 20-30%) power in the transfer and their listed mAh is not an accurate representation of how much power will flow into your device. The larger the listed mAh of the charger, the faster and more fully your device will be charged. However, with larger capacity come higher prices.