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zifis's Avatar
zifis is offline zifis
2011-05-13 , 12:05
Posts: 308 | Thanked: 729 times | Joined on Jan 2010 @ Athens, Greece
#1
I have never had the phone charge via USB before and 4 hours is double the time it takes the wall charger to fully charge my device. Is this normal?
 
artishox is offline artishox
2011-05-13 , 12:09
Posts: 32 | Thanked: 17 times | Joined on Oct 2010
#2
Who knows, my phone charges on USB in 3-4 h, but on wall charger it will not charge at all - I can keep it on wall charger and battery will not be depleated but it will not charge as well.
 
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zifis is offline zifis
2011-05-13 , 12:13
Posts: 308 | Thanked: 729 times | Joined on Jan 2010 @ Athens, Greece
#3
I am sure there is a reasonable explanation for both our cases...
 
AgogData's Avatar
AgogData is offline AgogData
2011-05-13 , 12:46
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#4
USB chargers take longer than the wall charger, wall charger takes about 1.30 hour while the USB charger takes about 3-4 hours. I once heared a theory but im not sure weather its right or not saying that the USB charger is more stable than the wall charger and makes the battery last longer.
 

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zifis's Avatar
zifis is offline zifis
2011-05-13 , 12:56
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#5
The green light is on after 4 hours and 40 minutes.

AgogData I hope you are right and also I hope my battery is not fried :P
 
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dr_frost_dk is offline dr_frost_dk
2011-05-13 , 12:58
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#6
Originally Posted by AgogData View Post
USB chargers take longer than the wall charger, wall charger takes about 1.30 hour while the USB charger takes about 3-4 hours. I once heared a theory but im not sure weather its right or not saying that the USB charger is more stable than the wall charger and makes the battery last longer.
well if both chargers and the N900 charges the battery to the same voltage then the battery will not last longer with one or the other.
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Wichall is offline Wichall
2011-05-13 , 12:58
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#7
USB outputs lower mAh than the wall charger, it also takes about that long if you use an old Nokia charger with the adapter that comes with the N900
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Den in USA is offline Den in USA
2011-05-13 , 13:00
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#8
Originally Posted by AgogData View Post
USB chargers take longer than the wall charger, wall charger takes about 1.30 hour while the USB charger takes about 3-4 hours. I once heared a theory but im not sure weather its right or not saying that the USB charger is more stable than the wall charger and makes the battery last longer.
You are correct. When a battery has been discharged, it has a low internal resistance when it is connected to a charger. If the charger can provide 900ma current, then the battery will heat up until the internal resistance goes higher. If you use your usb port on a computer to charge your battery, you are limiting the current to about 500ma. This also limits amount of heat being dissipated by the battery during charging. Less heat, longer battery life. In the old days, we used a formula to determine the proper charge current for a battery. If a battery was rated at 1200ma hours we would limit the charge current to 10% of that, or 120ma. Then people insisted on being able to do a "quick charge". Instead of charging at the 120ma, they built chargers that charged at a much higher current. now, instead of replacing batteries every three years, they had to replace every year or even every six months.
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Last edited by Den in USA; 2011-05-13 at 13:15.
 

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zifis is offline zifis
2011-05-13 , 13:14
Posts: 308 | Thanked: 729 times | Joined on Jan 2010 @ Athens, Greece
#9
You guys are one of the best reasons why I don't want to give up my N900
 
shardul is offline shardul
2011-05-13 , 13:22
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#10
I think your n900 is hungry.
 
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