I recently bought a solar charger (which I will probably write about later). It was taking some time to charge up so this got me interested to find out as to how long does it take to charge things up.
Here's the calculation: -
Batteries are rated with a capacity of mAh which is milliampere hours while the charger may just have an mA rating.
Time taken in hours=mAh rating of your battery/mA rating of your charger
To convert A to mA, multiply the value by 1000.
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