WH, AH , V
I would like to understand how to read those numbers and see how many times a power bank charger can recharge my phone or laptop.
In: 0
As others have stated, it’s watt-hours, amp-hours and voltage.
Voltage will typically be constant in a phone battery pack, although it may change depending on whether it’s smart enough to communicate with your phone and go into “fast charge” mode If it’s an older/more basic one, it’ll probably have a constant voltage of 5v.
However, watt-hours and amp-hours are measuring related but different attributes.
Put very simply, amperage is “how much current is flowing” and wattage is “how much work is being done”. When we measure watt-hours and amp-hours we’re essentially saying “this device can provide x watts for y hours” or “this device can provide x amps for y hours”.
For the purpose of a phone battery pack you’re more interested in the watt-hours measurement, although the amp-hours one may also provide some insight- if the phone has a “fast charging” mode, it may draw much more current and charge faster, but at the cost of total charging ability due to losses from the device working so hard.
One watt-hour on a 5v battery pack would be 0.2 amps for one hour. Many phones with a “fast charge” mode will try to draw far more current, so if your battery supports it, it might draw far higher currents, 2.5 to 3 amps at 12 volts, which would be about 30 watts.
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