The Google Pixel is Google's first flagship phone, released on October 20, 2016. The 5-inch AMOLED display device comes with 32 and 128 GB storage options and is available in three colors; Very Silver, Quite Black, and Really Blue.

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After 7 days fully drained, phone will barely charge with USB-A cord.

I recently broke my pixel screen, and during the replacement I saw no reason to leave it on the charger, uselessly receiving calls and texts and what not, and since the screen was both black and unresponsive, I couldn't turn it off while it still had a charge. I let it drain itself, and left it alone until I had the replacement screen a week later.

Backstory: I have frequently used a 3.4 amp wall charger with the USB-C to USB-A cord, as well as a 20k mAh power bank with a 2.1 amp port, and they both work just fine. Even with the USB-A cord, I usually got "rapidly charging" with the wall charger, and if temperature and power level conditions were right, I occasionally got it with the bank as well.

After the screen replacement, the pixel still charges just fine with the 3.8 amp OEM charger, USB-C to USB-C, I get the "rapidly charging" message and it charged to full in around 2 hours, which is the same speed as when I got it out of the box.

However, since the replacement, my phone *almost* cannot charge with the USB-A cord. When plugged into my power bank, it will simply hover at it's current level if I'm using it (right now, I've gone from 6% to 8% in an hour) which is not normal. If the screen is off, it still takes 4-6 hours for a full charge, even when the starting point is 15%. Using the wall charger, it's the same speed with use, and without use it's 3-5 hours. I've used two USB-C to USB-A cords, one of which is the OEM cord.

I've checked OEM A cord for damages or dirt, there is none, and the other A cord is brand new, rated to 3 amps. My question/fear is, have I destroyed my battery's ability to change normally with any current under 3.8 amps? If that's the case, is there a way I can retrain the lithium ion battery to accept a charge easier? Multiple sessions of 20% to 80% and back again or something? Fully drain and fully charge it multiple times? Simply keep using it as normal and wait for it to "heal" it's ability to accept a charge over time?

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Discovered the answer. Li-ion batteries hold a charge between 3.6 volts and 4.4 volts (or so, it varies by phone model), and in that range is your 0-100% battery life. There is a "cutoff voltage" point where the battery just doesn't have enough power to push energy to the entire motherboard, and at that point it encounters a hard shutoff. This is around 3.6-3.5 volts. Unfortunately, the lower your phone's voltage is, the faster it can drop under use. From 4.4-4.3 volts takes maybe 20% of your battery, but 3.6-3.5 only takes 5%.

An interesting phenomenon is that, when you leave your phone in a state of drain, not charging it for a time after it shuts off on it's own, the battery will continue to drain slowly due to it's nature as an always-connected component in all modern smartphones. So over time, over a week or month or whatnot, that battery can drain down to somewhere around 2.5 volts, when it doesn't even have enough push to reach the first component, the power regulator chip, on the motherboard. Some phones have a separate power channel that allows the phone to power on while connected to the charger whether the battery is charged or not, and some phones require a battery charge to power on regardless of whether it's plugged in or not.

I don't have a 100% definite answer, but my theory is that the Google Pixel is one of the former cases, since it was able to turn on immediately after plugging it in (side note: iPhones are of the latter case, if you remove or fully drain the battery, it will show that dim red "low battery" symbol until it's charged up enough to power on under battery power alone). The explanation for the slow charging, then, is that the power regulator chip that measures the voltage and then displays that as a percentage, wasn't able to reconcile the lower than expected voltage or it took longer than expected to get it back to it's base level of 3.5 volts.

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For the screen replacement you only took the screen out right and no other cables?

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Correct, I only replaced the screen tape and the screen (new screen ribbon cable included). I didn't open up the phone or touch any internals beyond that, and when the screen is removed no internals are exposed.

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I should mention that I've already done a complete sweep of possible software issues, including checking app battery useages, using the developer options to temporarily terminate all non-OS processes, as well as simply charging it while running in safe mode. Those options didn't yield any definite improvements, but I haven't tried them more than once.

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