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It was a fantastic idea! We had the prototype software and it worked great.

Take your old phone, put Docker on it, and do anything!

Phones, even very old phones, are incredibly capable devices: cameras, antennas, accelerometers, large touchscreen. They just need a new purpose.

Well, the other thing I'd want from a repurposed old phone is to remove the battery. Having it glued to the screen would be a problem.

If its rooted you can put a charging controller on it.

The battery is not dangerous or even particularly perishable if its always kept between 30% and 60% charge.