Belkin 1000mAh Battery Pack

Product Information

In fact, our testing confirms what battery makers usually claim. A battery maker will claim between 60% and 70% efficiency, so that 10,000mAh battery will only give your phone around 6,000mAh of extra battery charge, at the least. In practice we find around 65% efficiency, though occasionally we can do even better.

These portable power banks are popular among phone users for a good reason—they offer enough capacity. They are also quite lightweight and easy to carry. Usually, you begin charging your phone with the power bank from 20-40% level. So, with bestselling 10000 mAH power bank such as Anker PowerCore 10000 USB-C or ZMI 10000 USB-C you can expect – I once explained about the numbers printed on power banks. Capacity is one of those complicated technical terms. But the rule is simple: the actual capacity of a power bank is about 2/3 of the rated capacity. Part of the energy will be lost in the conversion and during charging. For example, a quality 26800 mAH powerbank such as Anker PowerCore+ 26800 will have a real world capacity of 26800/.66 = About 18,000 mAH. Hence, it will charge an Apple iPhone 13/12 (2815 mAH battery) about 18000 / 2815= about 6 times! It will charge the iPhone 13/12 Pro/iPhone 13/12/11, or Samsung S10 about 18000 / 3400 or about 5+ times.So, if you wanted a 1000mAh powerbank and planned on using it for 4 hours each day, your calculation would look like this: 4 x 1000 = 4000mAh . Finally, subtract the power bank’s weight from that number to find out how much mAh you actually need.

As the actual charging performance may vary from device to device, you can roughly assume the 2/3 capacity number to calculate how many times your smartphone will get charged by your powerbank.

Power bank terminology

Anything smaller may not be sufficient to recharge your devices fully. And if you’re planning on using the power bank primarily for emergency situations or travel purposes, select one that has more than 10,500 mAH so it will last longer between charges. How do I choose the right powerbank for my needs? Fast charging is great when you are in hurry. However, fast charging uses high voltages (9 volt or 12 volt) and this further reduces the usable battery capacity of the powerbank and drains power bank battery much faster.