Noticed that power banks that could charge laptops cost a lot more
than power banks that have USB output ports only though they
are of the same mAH capacity.
Eg: it's common to get 30000mAH powerbanks for USB devices at USD35 or less:
but those that could charge laptops are usually above USD60 (can go up to USD300
even for Hyperjuice for Macbook Pro of 8000 mAH only).
Even if they are from the same brand of same capacity, eg: Vinsic, the price difference
is stark, eg Vinsic Warrior 30000mAH for laptop is USD60-90 but Vinsic 30000mAH
powerbanks for USB devices is about half the price.
What's the reason? Isn't same mAH means the chemicals used to store the
electricity of about the same?
I'm asking this because if it's feasible to make laptop powerbanks cheaper
commercially, I plan to market it locally.