How to purchase the best mobile power
What capacity do I need?
Capacity, expressed in milliamp hours (mAh), is a rough indication of charging capacity. The higher the number, the more power it can provide to your device before the mobile power source runs out of juice. Try to find a mobile power that can fully charge your smartphone at least twice before you need to recharge it, as this will give you a day or two of coverage at a time.
Mobile power can range from a single charge (3,000mAh) to well over (20,000mAh), with most of the latest smartphones having a battery capacity of about 3,000mAh. a 10,000mAh mobile power should be able to charge your smartphone 3 times, while a 20,000mAh mobile power should be able to charge your smartphone more than 6 times.
How long does it take for a mobile power to charge my device?
Most models can charge a standard 3,000mAh device like a smartphone in about 90 minutes; no longer a red flag. The charging time of a mobile power is not a big deal as you can plug it in overnight, but usually the faster the better.
In order for the mobile power to charge your device, some matching needs to be done. The output of the mobile power needs to meet the requirements of the device you want to charge. Smartphones can be charged with very little current, tablets need more, and laptops and handheld game consoles need more.
If the output matches or exceeds the needs of the device, it will charge while in use. If the output meets or just falls short of the device's requirements, it will slowly extend battery life, but will not charge while in use. In this case, the mobile power "powers" the device, not charges it. However, if the device is turned off, it will charge.

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