I was just wondering around, looking for how to charge my phone on the go. Because Wednesday morning I'll go camping. I just don't want to buy a cheap chinese power bank to charge my phone once.
And then I found out that I can charge it with batteries, AAs probably being the best because they don't take up so much space and hold around 1500mAh and can output around 2A max. I am just asking, how should I do it?
- Should I wire two batteries (3V) in series and then make a step-up circuit (and how exactly would I make one with minimum power loss)?
- Or should I connect four (6V) and put some kind of regulator/resistors to it?
- Or could I just go with three batteries (4,5V) when my phone requires 5V (does it really require 5V, and could I still charge it relatively fast and at least efficient)?
As I already mentioned, I would like an output of 5V and over 750mA, and I'd like something closer to 2.1A. So what would be the most efficient and fast charge method (Efficieny first, I want the max juice out my AAs) that I could get my hands on before going, get all the parts (no ordering online) and building it all tomorrow?
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