The message: "your battery needs charging" then the device will automatically shutoff when battery voltage is at a critical level if you don't put it on the charger.Is there a reason why this does not happen on mobile phone or tablet, what do they use ?
Seriously though I'm wondering if you could use that battery monitoring app to do some type of switching.
Another way is to use a comparator (either digital or analog) circuit monitoring the battery then switching a mosfet to power the device ON or OFF.
A single cell Lipo battery is normally charged to 4.2 volts. At that voltage the circuit would power the device ON and shut the device OFF at lets say 3 volts if required.
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