[TechniSol]

This is not an android device, e-ink displays use much less power than active TFT or the like, which is why we recharge after around 46.5 hours of actual reading/operation over a 24 day+ period with a Glo rather than 6-10 or so hours with the average Android tablet... at least according to the actual usage test I logged/performed with my Glo last year.(that was with lighting around 20% brightness as I recall)

All I was saying was I assumed you'd have a way to keep it from coming out of sleep every 20 minutes or that your code/timer wouldn't be executing because it was "powered down". If it is running every twenty minutes and impacting sleep mode then it's drawing current that need not be drawn because nothing is changing while the device is being slept. E-ink is all about low power. Granted it may not be a big impact if it's just checking for db change when there can be none, but every milliamp counts... Have you noticed how the average current draw drops off after a few seconds of no change while the device is running with only the normal code executing? This is why people had such trouble when using sleep covers that had a pocket that tripped the IR hardware into a powered mode by blocking the IR and preventing a proper sleep mode. Typical battery life in that situation was under 72 hours in what people thought was sleep.

I think you're doing great, keep going.