ttabbal wrote:Well, the only products I have found are rather expensive. I would like a cheap solution ($20?) to deal with the problem.
I'm more interested in charging, but a simple undervoltage shutoff would be nice to keep them from getting too discharged.
wiml wrote:Camera and cellphone batteries occasionally have surprisingly smart monitoring/metering/protection circuits like the TI bq27200. Might be interesting to see a sparkfun battery pack with a chip like that for microcontroller projects.
wiml wrote:I'm probably the wrong person to ask market research questions of (especially since what I want changes drastically for each project). But, off the top of my head, what I'd like is a board with a wider voltage input range (so it could charge off USB, or a solar panel, or a wall wart), a battery monitor / fuelgauge / protection circuit (like the bq chips), and ideally a switching regulator on the output to power my device. I'd be willing to pay, oh, $20+ for that? The bodhilabs vpack boards seem reasonably priced at $10, and this board would do roughly twice as much.
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