(x-post from the 'other' category, hoping some people here might be able to help as well)
Hi all, I'm working on a portable raspberry pi project which I would like to be battery powered. I would like to keep the batteries in the system, such that when AC power is plugged in the batteries are being charged and the pi is powered, and when unplugged the batteries keep the system powered.
I have 2x 3.7v batteries. My plan was going to be to buy two of these chargers:http://www.adafruit.com/products/280
and to hook one of them up to each battery. So that takes care of most of the equation. My problem comes when I get to wiring the batteries in series - I need to provide 7.4v to power my display. Just wiring the batteries in series would be no problem, but I'm not just wiring the batteries together - I've got the outputs from the battery chargers to work with. Is it possible to wire two of these chargers up in series, so that they provide a combined voltage? Is there another chip or part I'd need to facilitate this?
Don't have a ton of electronics/power experience so any advice is appreciated.