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My apologies if this is the wrong forum to ask.. But, I would like to DIY a phone case with a built-in additional battery. Preferably Li-Po because they are flat in shape. I don't want to remove my original phone battery. It's new and works well. I just want to take a power bank concept...

Okay so this is probably something extremely obvious for everyone here.. But if I were to build a battery pack of let's say 12v.. How would I power a household device that needs 110v to function. Lets say a hairdryer that is plugged in a regular outlet and spends 1kw of electricity. Would I...

So I have decided to finally dive in and try to make a tiny system. I am planning on taking either a NiMH or a Li-ion cell. A single cell will probably be enough. Then wire it with a tiny solar charger in order to charge it. Literally trying to make one of those solar power bank chargers that...