Conclusion:
Power bank is essential hardware for every one as smartphones are growing more powerful and due to increase of usage on smartphones there is fast discharge of the battery, so to boost up your smartphone again with power supply power banks are used. If you are looking for heavy duty power bank then Mi power banks will be the right choice, price Mi power banks is reasonable too.
One can charge their smartphones for more than 2-3 times and this is very useful while travelling. Better build quality and super performance is the key feature of this device so we can say these devices are worth spending 799 rupees and 999 rupees with respect to the power supply they offer.