I've seen these on eBay in various forms and decided to get one to reverse engineer.
Rather pleasingly, they have used standard components to make the device, so it does offer a level of hackability for custom voltage threshold measurements.
In hindsight I wish I'd got a version for higher voltage use, as the single cell version dims the display noticeable over the discharge levels. That could be a good thing for a continuously active display though.
The voltage thresholds I measured tallied well with the spec of the module, so it's a useful indicator of cell charge status.
I've not worked out what the mysterious indicator LED position is for. A quick search didn't reveal a version that used it. I've just ordered a different version that uses what appears to be a microcontroller to do the job, with a selectable voltage scaler for multiple lithium battery size options.
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