Nexus 7 charger amps

Nexus 7 charger amps DEFAULT

Google Nexus 7 Charging

When I first got my Nexus 7, I was curious how it was able to charge at different rates on different chargers. There are quite a few threads concerning people having problems with their devices charging at a reasonable rate, but there was a dearth of actual data. Using a bench power supply, and a cut up USB extension cable, I took the measurements myself.

The Google Nexus 7 uses the Qualcomm PM Quick Charge IC, which allows it to charge at a range of currents depending on the voltage sensed at the device. For this reason, both the voltage drop of the charger and the voltage drop of the cable under load will factor into the maximum current drawn. When the device is first plugged in, it ramps the current up in stages until the voltage falls below volts. If at any point the voltage falls, the charger will revert down to the next level. However, under no circumstance will the charger increase to a higher current level after the initialization process. This prevents the device from cycling between two charge levels as the voltage drop rises and falls. For this reason, measuring the voltage across a charger while in use is not a good indication of the current level -- by the time a measurement can be taken, the Nexus will have reverted to a lower current level, and the voltage will have come back up.

Nexus 7 USB Charging Current
VoltageCurrent (A)
>
<<

The data pins of the USB cable were shorted together in these tests, and bench power supply was used to supply and measure the current. The internal battery voltage was around mV during these tests.

Nexus 7 charging current chart

It is also worth mentioning that below ~ volts the current tappers down to zero at a voltage dependent on the internal battery voltage. It appears that the bucking converter in the charging circuit of the Nexus 7 has a minimum voltage drop of ~ volts. This means that the Nexus 7 will stop charging if the input voltage is less than the internal battery voltage plus volts.

Image from http://thinkertry.com//08/25/nexusreview/

As long a cable of decent quality is used, the stock charger (rated at A) should be able to charge the Nexus at the highest rate. While any charger rated amps or higher should also function at this rate, the lower the sticker rating, the more likely the module will exhibit excessive voltage drop. I imagine this is why many people recommend a charger rated to at least 2 amps.
Sours: https://sites.google.com/a/mst.edu/robert_ruark/projects/google-nexuscharging

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Nexus 7 charges very slowly, even with 2 amp chargers

I'm facing a rather painful issue with the battery life/charging issue with my Nexus 7 ()

  • When idle and plugged into my 2A charger with the stock USB cable, it charges VERY slowly. I'd say under 10% per hour.
  • With just light usage over the course of an afternoon/evening, the charge got dropped to 50% (after charging it overnight and more).

I'm sure that something is wrong because no tablet should be performing that way (comparing to my other tablet, an iPad)

Update: I plugged my iPad1, iPhone5 and Nexus 7 into the same port on my Macbook Pro Retina. I've added a (mashed up) screenshot of all the 3 cases below and it's clear that the Nexus 7 never even demands anything above mA on a 2A port despite using the stock cable (and another microUSB cable). I'm now guessing this is a Nexus 7 firmware/software issue. Any fixes? That extra operating current should be mA so it totals to A (="2A" ports).

enter preformatted text here

Full resolution screenshot

Details:

  • Android v (stock image)
  • Settings => Battery
    • Screen (77%)
    • Android OS (6%)
    • Tablet idle (6%)
    • WiFi (5%)
    • Maps (4%) (Maps isn't even running weird!)
    • Android System (2%)

I mostly use Chrome, Currents and Play Magazines so it's just light reading. I'm surprised those apps don't show up on the battery energy audit list (which is great compared to iOS BTW).

Question: What can I do to charge this device faster and use less battery? My expectations are anchored by my other tablet (an iPad) which charges a lot faster (2A charger again) and uses about 20% each day for casual reading vs 50% each day on the Nexus 7.

Sours: https://android.stackexchange.com/questions//nexuscharges-very-slowly-even-withamp-chargers

I threw my shirt over you, and you seemed to feel warmer, we hugged closer and fell asleep under quiet psychedelic rock. History was created: December 26, 2013, 10:14:38 PM. Posted by: Ilya Balmakov.

7 charger amps nexus

Ares' kisses grew more and more passionate. Ilona wriggled under them, moaned, ruffled his hair with her hands. Now she had only one desire: that the man who owned her did not stop as long as possible, but at the same time received exactly the pleasure that a woman.

Google Nexus 7 - Charger details - Power requirements if using an alternative charger.

And she immediately fell back onto the pillow. "This is all true. So everything that happened yesterday was not a dream. Regina Mills, what do I do with you now. I can't hurt you.

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So, it gave out a little on the legs, and that's all. Then she set her straight, ordered him to apologize again, and only after that she allowed me to get dressed. And then.



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