Portable Battery for smartphone

Dear All,
I am currently doing a business plan about a portable battery for smartphones and I found this forum, I would just like to do some research and see how many people are interested in this idea, if you are, please send me an email, joehui1126 at gmail, information is below.
Thank you,
Joe

Problem:
Portable Battery was a bulky product which requires an USB wire to transfer power from the charger itself to the phone, but they became smaller in size, and some models do not even require an USB wire.
The main problem of a Portable Battery is it’s convenient, as it is not an ‘open and use’ product, we now have to recharge 2 things instead of 1 at home.
Solution:
The product concept of this company is to create a small in size Portable Battery named Dual Battery which could be recharged by both USB and battery (small batteries such as AA, AAA or even button cell) and suitable for all smartphones. . An AAA battery could only recharge the phone partly, therefore this product requires user to switch the battery once it has been consumed, but it is extremely useful in the case of emergency when both the power of the phone and USB recharge have been consumed.

---

› See More: Portable Battery for smartphone

Products like this already exist but if you can do it better than what is already on the market then I'm sure people would be interested

sent from my phone

You can add solar, and a hand crank to it also, if you feel it would benefit the user.

I'll definitely try this low-cost AAA-sized rechargeable battery-operated mobile. You can recharge AAA-sized batteries using a compatible charger as it's dual-power mobile. Whereas I know aa aaa batteries have a number of advantages over alkalines, they're not necessarily the best choice for every application. Rechargeable batteries work best in applications with long run times that operate at a constant discharge. Examples include toys, remotes, and video game controllers.