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Tablet charges but shuts off after being unplugged?

I got this tablet a while ago, set it up, and used it for about a week. Then shut it off and never used it for a few years tbh. Its in perfect condition, so I connected it to a charger and let it charge. Immediately after unplugging it, the screen went black and wouldn't come on. I plugged it in, and it eventually came back on with 0% battery. I've used the tablet less than an hour total, and it's been stored in good conditions without moisture, excessive temps, etc. Why would it do this?

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Hi @larryb23

Lithium batteries internally discharge as a normal function of their design i.e. battery charge capacity diminishes even if they're not being used. Usually 2-5% per month but this accelerates the longer it is not recharged

If not recharged for a long time they can become depleted beyond recovery or if you can get them to charge they may not be able to handle to current load when required to do so.

You may have to replace the battery.

What is the model number of the tablet as shown on the back cover of the tablet? It is difficult with Kindles to find the correct replacement parts based on the model name only but knowing the model number will usually find them. Also it helps to find the correct guide for how to replace the battery as well

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@jayeff My only question would be, if you know the answer, do you think it could be a problem with the charger itself? Could that have caused the battery issue? I'm only asking because the cord and charger I used, I also used to charge my playstation 4 controller. And coincidentally that controller also developed the problem of shutting off whenever it's disconnected from the cord. I have used the charging box on other occasions, but I just recently bought new cords to use for it as my last one had become unusable. I had just changed the charging port in the controller, so I thought that maybe it was what caused the battery issue in the controller. But now I'm thinking it may be the new cords? Also btw, to answer your question, I will say, I appreciate the help but honestly I feel like at this point if the battery needs replacing it may not be worth it considering I didn't use it much at all, and just randomly decided to use it out of curiosity.

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As far as i can find out a Fire 7 tablet has a USB2.0 port which means that it should be charging at 5V max, as this is the specs for USB2.0.

You would need to check the voltage output from the adapter to find out it was more or less than this or not.

If it were more it will overcharge the battery which would damage it (depends on what overvoltage protection, if any, is provided in the tablet) or maybe damage the battery management circuit in the tablet which may affect how it charges or operates anyway..

If it were less than the required voltage it may be undercharging the battery which would also cause a problem as this tends to shorten its life.

If the tablet is still in good condition donate it to someone who will fix it and use it. Better that it is used rather than going to landfill, especially with a battery still in it.

Faulty cords may affect it but usually they have a more damaging effect on the charger rather than the device

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@jayeff The adapter says Output 9.0V or 5.0V. it's an adaptive fast charger from Samsung. If it were to be the adapter, I'm unsure of why the battery would only be effected immediately after changing the charging port on the controller and using a brand new cord. Because like I said, I've been using that adapter for a while, just got a new cord. I'm not going to throw it away, I may decide to replace the battery at some point. Its not a huge priority to me though. I'm just frustrated by this happening.

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For adaptive fast charging it must be USB-C.

With USB-C there is communication between the charger and the device and this will confirm whether the device can receive the 9V for fast charging or if not that 5V would be supplied.

USB2.0 is 5V max and only has the 4 wires, 2 for power and 2 for data. USB-C can have from 6 to 24 wires depending on what functions are catered for e.g. data, adaptive power (5V or 9V), power delivery (PD up to 20V), video etc.

It's always possible if it were USB-C that if there was a cross connection i.e. short circuit between two pins in the USB-C cable plug or USB-C socket in the device that it may cause a problem of course.

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@jayeff I believe the adapter is from an older phone, it has the standard usb rectangular hole, but it was that regular USB to USBC on the other end that went into the phone. That's why I'm able to use it for the micro USB connection on the tablet. Do you think that this connection somehow defaulted to provide 9.0V and fry the battery?

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