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2. How to choose a portable charger - AOL

   www.aol.com/choose-portable-charger-194005250.html

   Compatibility, charging capacity and speed can all be determining factors when choosing the right portable chargers for your devices.

3. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   Introduced by Sanyo/Panasonic for use in portable power tools as higher-power and higher-capacity successor for 18650 cells. [citation needed] Quickly superseded by 21700. Also used for larger electronic cigarettes. 21700: 21–70, 2170 2,000–5,800 [215] [216] 21: 70 Announced by Samsung [217] and LG Chem in 2015 for use in electric bikes. [218]

4. The 10 Best Portable Chargers and Power Banks - AOL

   www.aol.com/lifestyle/10-best-portable-chargers...

   In general, the bigger the mAh unit, the larger the battery capacity, and the more power a portable charger can hold and give to your devices. Most smartphones have a battery capacity of between 2 ...

5. Battery charger - Wikipedia

   en.wikipedia.org/wiki/Battery_charger

   A battery charger, recharger, or simply charger, [1] [2] is a device that stores energy in an electric battery by running current through it. The charging protocol—how much voltage, amperes, current, for how long and what to do when charging is complete—depends on the size and type of the battery being charged.

6. Rechargeable battery - Wikipedia

   en.wikipedia.org/wiki/Rechargeable_battery

   Rapid chargers can typically charge cells in two to five hours, depending on the model, with the fastest taking as little as fifteen minutes. Fast chargers must have multiple ways of detecting when a cell reaches full charge (change in terminal voltage, temperature, etc.) to stop charging before harmful overcharging or overheating occurs.

7. Battery pack - Wikipedia

   en.wikipedia.org/wiki/Battery_pack

   A portable power bank charging a mobile phone. A power bank is a portable device consisting of a battery, a charger to interface battery with charging power source and an output interface to provide desired output voltage. [10] Power banks are made in various sizes and typically based on lithium-ion batteries.