How much more percentage of battery do 4200 mAh & 2200 mAh power banks give me separately?
I'm taking about a battery case for my iphone
It's nor very clear what you are asking.
But…
A 4200mAh battery has a capacity equal to 190% of a 2200mAh one.
Conversely, a 2200mAh battery has a capacity equal to 52% of a 4300mAh one.
The 4200 mAh battery will give you almost twice as much battery life
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