How do I build my own Camera Battery Charger using USB? Answered
I'd like to build a Charger for my 8.4v Sony Camera Batteries. I have a few of them but decided it might be interesting to learn how to make one that will utilize USB.
From what I understand the Battery is a 8.4v Lithium Ion (i.e.. 2cell 4.2v Battery Pack). The chargers I have state an output of 8.4v and 400mA. I figured it might be possible to utilize the 5v that USB provides and I guess step up the voltage.
I found plenty of charging controllers that seem to be good for 1cell (4.2v) batteries, but not seen any way to charge a 2cell battery pack.
I guess I am hoping for some guidance on what I will need to:
1) Step up USB 5v to 8.4v
2) Control a Charge to a Lithium Ion 2 Cell Battery Pack