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Old January 5th, 2013, 10:42 PM   #1 (permalink)
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Default Losing charge while plugged in and using.

Long time lurker, first time poster... Lol (edit: Ok, apparently this was my 3rd post... lmao)

But seriously. I just got my Nexus 7 about 3 weeks ago and I absolutely love it. My only issue is that if I have my N7 plugged in and I am using it that it still loses a charge even though it states that it is charging. I recently noticed it when playing Final Fantasy III when I lost 3 to 4% charge. I am charging fine when not using it and it is placed in standby mode. I am assuming that maybe I am using more power than it can drawing from the charger, but I was wondering if anyone else was experiencing this. Before my N7 I had a TF101 that died but I never had charge while using issues like I am experiencing now.

s2

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Old January 6th, 2013, 12:49 AM   #2 (permalink)
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Using the wall charger which came with the N7, the tab should charging while using it.

But using a generic charger or a notebook's/PC's USB port could supply not enough current to charge the battery while using the tab.

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Old January 6th, 2013, 03:37 AM   #3 (permalink)
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I find the N7 charger takes about three hours to charge my N7 from near zero to 100%. However a combination of max screen brightness and a really CPU intensive game will flatten a fully charged battery in about three hours. So there are circumstances in which the charger could struggle to keep up.
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Old January 6th, 2013, 05:04 AM   #4 (permalink)
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Quote:
Originally Posted by jhsrennie View Post
I find the N7 charger takes about three hours to charge my N7 from near zero to 100%. However a combination of max screen brightness and a really CPU intensive game will flatten a fully charged battery in about three hours. So there are circumstances in which the charger could struggle to keep up.
From what I can tell: no. The charger will always be charging the battery, albeit slower when on max brightness and max cpu load. From what I know the charger doesn't feed its max capacity when it's just charging, but the amps are upped when you use the nexus while charging.
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Old January 6th, 2013, 11:14 AM   #5 (permalink)
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I know that I have it on max brightness and I am assuming on max cpu load as I am playing FFIII and occasionally it will lag just a bit at the start of a battle scene. I'll start checking out the battery monitor to see consumption rates while charging and see if I cannot figure it out.

Thanks guys!

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Old January 6th, 2013, 11:29 AM   #6 (permalink)
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A battery monitor is an good idea
Battery Monitor Widget shows the current by time in a graph.

Let us know your figures ...

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Old January 6th, 2013, 01:19 PM   #7 (permalink)
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The charge time also depends on the quality of the power supply. For example, while on holiday in Lanzarote last year, I found I had to switch my Nexus 7 off completely to get it to charge at all. Then it would take all night if the battery was quite low on juice.
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Old January 7th, 2013, 09:16 PM   #8 (permalink)
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I have found that FF3 uses A LOT of battery power, so much so that even when I have it plugged in with the stock charger it still has a net loss of power. I am using a longer cable than the one that came with the tablet, but I would attribute this to the fact that FF3 is a battery hog.
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Old January 7th, 2013, 09:49 PM   #9 (permalink)
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I had the same problem with the charger that came with it, and when I used a 3rd party charger it worked better than the Asus one.
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Old January 8th, 2013, 05:36 AM   #10 (permalink)
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I bet the n7 gets really hot when you are playing? That's where all the power is going! Plus if it is hot it will limit the charger rate. The only way to really tell is to have a wattmeter on the ac plug of the charger.
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Old January 8th, 2013, 11:43 AM   #11 (permalink)
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Quote:
Originally Posted by JanComputerman View Post
...Plus if it is hot it will limit the charger rate ...
Good point

The Li-Ion battery's temperature operating range is for charging 0C (+32F) to +45C (+113F).

So the battery it's the phone's most sensitive component.
Therefore battery won't be charged if its temperature is above +45C (+113F) because the phone's charge controlling will project the battery.
Therefore it'll shut down charging until the battery's temperature will meet again the charge operating range.

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Old January 20th, 2013, 08:59 AM   #12 (permalink)
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Default AW: Losing charge while plugged in and using.

Maybe a simply approach ... you'd chose a microUSB cable as short as possible and with thicker power wires because of the larger amount of amperage that charging and the used apps (at the same time) are needing.

Quality mircroUSB cables like these by DeLock have 24AWG for the power wires instead of 28AWG like the data wire.

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