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brecklundin is offline brecklundin
02-21-2008 , 03:43 PM
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#1
Is it just me or does the battery actually discharge even when using it while connected to the power adapter when using the tablet?

I see a decreased power consumption rate but the battery charges to a max of 98.7% (pretty typical for a new LiON battery as you never really get a true 100% of potential capacity battery, as they begin to degrade the moment they are made) on my N800 then decreases about 0.2%/hr or so when using it while plugged in...

Or maybe I am just seeing things...I never underestimate my ability to overlook the obvious and be wrong.
 
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Texrat is offline Texrat
02-21-2008 , 03:48 PM
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#2
Depending on what you're doing, I can see it as reasonable and possible that the device could consume power at a slightly faster rate than it's recharged... BUT I would hope the device is drawing from external current instead of the battery. However, I'm not completely familiar with battery charging technology...
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Benson is offline Benson
02-21-2008 , 04:10 PM
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#3
Yes, I seem to have experienced that when doing heavy stuff.
But when the battery is full and it stops charging, it waits until it sees the battery lower than some threshold to start charging again. Could you possibly be seeing that?
 
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Benson is offline Benson
02-21-2008 , 04:12 PM
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#4
Originally Posted by Texrat View Post
Depending on what you're doing, I can see it as reasonable and possible that the device could consume power at a slightly faster rate than it's recharged... BUT I would hope the device is drawing from external current instead of the battery. However, I'm not completely familiar with battery charging technology...
When you pull out the battery, while it's on the charger, it shuts off. Doesn't really prove anything, but it suggests that it might be running off the battery, which would of course allow a much less well regulated charger.
 

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Texrat is offline Texrat
02-21-2008 , 04:16 PM
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#5
That does seem to explain things, Benson. I didn't think of that (d'oh).

Time to return my dusty degree in electronic design, apparently.
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debudebu is offline debudebu
02-21-2008 , 05:40 PM
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#6
i have also noticed that my n800 discharges faster than it charges when using lots of bandwith--skype calls, large file downloads, etc. my guess is that nokia wanted to maintain compatability with their cell phone chargers and didntīprovide enough juice for high power consumption tasks. i have had this thing die on my twice while plugged in and charging. this is a major design flaw. another problem is that it seems to require a little power to start charging, but if the battery is completely dead how can it start charging?
 
brecklundin is offline brecklundin
02-21-2008 , 06:01 PM
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#7
ok...cool...thanks folks. Those are exactly the things I noticed. Actually in the antique days of laptops they once ran exactly the same way.

One of the benefits of the system running off the battery while the battery ran off the charger was it actually provides built-in surge protection as well as power conditioning to the device.

I consider this an actual benefit rather than a fault or bad engineering. It adds a wonderful layer of protection for the NIT itself.

Thanks!!
 
lm2 is offline lm2
02-21-2008 , 06:07 PM
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#8
My usage of the tablet while charging has been motivated and sanctioned by this post by General Antilles.
 
brecklundin is offline brecklundin
02-21-2008 , 06:09 PM
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#9
Originally Posted by debudebu View Post
i have also noticed that my n800 discharges faster than it charges when using lots of bandwith--skype calls, large file downloads, etc. my guess is that nokia wanted to maintain compatability with their cell phone chargers and didntīprovide enough juice for high power consumption tasks. i have had this thing die on my twice while plugged in and charging. this is a major design flaw. another problem is that it seems to require a little power to start charging, but if the battery is completely dead how can it start charging?
Sure I could see why it would maybe be considered a flaw. But I have extra batteries, I did not buy them with this issue in mind but, like with my laptops (all I have owned for about 15ish years now) I like to have at least two extra batteries as I am never sure I'll be near power when I run low. Heck for my current workhorse system I have two regular batteries and one super extended use battery (all from HP) and can go about 12-15hrs on a 17" laptop w/o needed to find power.

But I can sure see this as being a problem if you are low on power and then you plug in thinking that will fix it all. Or you run all day on power only to find your battery dead at the end of the day. Perhaps it should be incumbent on Nokia to mention this issue or provide a better power adapter that can keep up. That should be an simply fix...if the system will accept a adapter with a few more mA's...
 
brecklundin is offline brecklundin
02-21-2008 , 06:19 PM
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#10
Originally Posted by lm2 View Post
My usage of the tablet while charging has been motivated and sanctioned by this post by General Antilles.
Actually to me that entire thread has value for this topic not one "sound byte" post in the thread.

http://www.internettablettalk.com/fo...755#post129755

Decent and pretty accurate info on LiOH Poly batteries and how they generally work. The plug-in/unplugged when charged debate has existed since LiON batteries first hit the market. Generally speaking they work best when not allowed to drop below 40-60% before a full recharge. But dropping them all the way down is also needed periodically to help the power management calibrate/calculate the current state of the battery's capacity.

How charging affects a LiON Poly battery is debatable but in a nut shell it is a debate of an insignificant difference at the most. Use them as fits your needs and that is good enough.
Last edited by brecklundin; 02-21-2008 at 09:27 PM.
 
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