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I made a device that is up and running (screen is on) 24/7 and connected to AC charger. After only 1 year, the batteries of these devices are dead. I don't really understand since the device is directly connected to AC, the battery should be bypassed and never been used.

I made some current measurements and I discovered that the current consumed by the device is sometimes 0 for ~1 minute. So it is obvious that the battery is working because if AC current is 0 while the screen is on, it means the battery is working.

This power management does not make any sense. Is it the expected one? Is there any hack I can do using ADB commands?

thanks

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"I don't really understand since the device is directly connected to AC, the battery should be bypassed and never been used.

If you mean li-ion battery, cycle use is recommended since keeping it fully charged for 24/365 may shorten its life cycle as in your case.

Since you need battery as backup only, use UPS (Pb gel battery) coming with bypass instead

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  • This is a fairly frequent requirement, when doing DIY smart home or similar. It's easy to repurpose an old tablet/phone for a control screen, but the issue with power (and dying battery) is ever present. How do you fix it with a UPS? A tablet charge cable can be easily hidden in-wall (in-mount), but how do you hide a UPS? Finally, how would you configure the UPS to only turn on an supply power once the device battery is nearing depletion?
    – Slav
    Feb 11, 2019 at 21:33
  • " how would you configure the UPS to only turn on an supply power once the device battery is nearing depletion?
    – darius
    Feb 11, 2019 at 21:44
  • " how would you configure the UPS to only turn on an supply power once the device battery is nearing depletion? Just replace your device battery with small UPS. Rear window car camera comes with small capacity li-ion battery back-up but when you leave your car, camera gets disconnected from charger and li-ion battery leaves fully-charged status overnight. Use 2 batteries and a switch to make one charged on even days and the other on odd days
    – darius
    Feb 11, 2019 at 21:57
  • Car camera? I had to go re-read the OP several times to make sure I didn't miss any references to car cameras.... or cars... nope. Sorry dude, you totally lost me there
    – Slav
    Feb 11, 2019 at 22:08
  • smartphone's battery comes with charging controller built-in to prevent overcharge but a user is advised not to keep his/her smartphone connected to the charger, while making phone calls. I used my Android tablet as PC with external usb mouse, 3g modem, keyboard connected and non-stop charged. Today I develop 3D scanner with 20 usb 5Mpix cameras, sensing OTG charging pin. USB camera if connected to charger or PC switches from camera mode into charging mode, so I need to disable sensing pin with Arduino to keep camera on, when connected to PC via hub for data transfer. No easy solution
    – darius
    Feb 11, 2019 at 23:02

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