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If the amp is too high on the output, will it cause a power bank to overheat?

Yes, you can expect it to damage the power bank.
Standard mobile power banks have input and output capacities of 5 volts at 1 amp or 2 amps.
Amp is like volume of water in a pipe (its absolute capacity) at a time. Imagine that if you pour a huge volume of water (current) into a container that isn’t built to withstand it, it will overflow and if you continue to pour it in, the pressure could increase beyond breaking point and the container might just break/explode.
The other variables to consider are voltage and watts. These are beautifully explained on HetoGrow’s Quality Assurance webpage. You can scroll down to the section titled - How To Detect a Fake Solar Power Bank - Functionality, Quality and Originality Test

Limits of Power Banks
Power banks are especially designed to recharge mobile phones and up to 5 volts devices with USB cables at 1 amp or 2 amps. Power banks can be used to charge/power phones, notebooks, iPads, internet broadband modems, game consoles, off-grid 5V USB fans, light bulbs, bedside lamps, external computer hard drives, etc. The maximum input power to recharge a power bank is also 5 volts. It is important to keep to this upper limit. 

Similar to the Amp example above, if you force water from a large pipe into a smaller one, pressure in the smaller pipe will be higher than in the large pipe. If the pressure in the smaller pipe is higher than the maximum tolerance of the smaller pipe or any thing attached to it, there'll most likely be an explosion. Going over the intended limit of a power bank will most likely cause problems, especially if you are not an expert.

Dave Ebi is a Most Viewed Power Bank Writer on Quora. Join HetoGrow on Facebook, Twitter, Instagram, G+ or LinkedIn


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