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.
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V-volts
How many volts something gives . Commonly 5V but can be higher for things such as fast chargers or laptop chargers. 9v is fairly common for quick charging and 19v is fairly common for a laptop power adapters.
Ah-amp hour
How many hours a battery can power a device with a specific draw. If you have a 5ah battery and you draw 1amp then you should get roughly 5 hours of run time.
Wh- watt hours
A watt is your current (amps) multiplied by your volts. If you have a 9volt 5amp hour battery then you will have a 45watt hour battery. If your battery was 10 amp hours then it would be 90watt hours
I would compare everything in watt hours if you can as that removes the complexity of volts and amp hours but take any specs with a big grain of salt as the numbers are usually up to’s and there can be a lot of inefficiencies and losses.
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