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2009-10-03
, 20:30
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Posts: 145 |
Thanked: 33 times |
Joined on Dec 2007
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#32
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2009-10-05
, 16:07
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Posts: 1,258 |
Thanked: 672 times |
Joined on Mar 2009
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#33
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the capacity of my Mugen battery is not any higher than the Nokia battery, advertised claims to the contrary.
And two batteries I've had were unable to survive a deep discharge, unlike the Nokia batteries.
I used flip clock to keep the N810 awake, and browsed to a web page that I set to refresh every five minutes. As the graph shows, the capacity of the new "1800 mAh" Mugen, on two different runs, was about the same as the well-used 1500 mAh Nokia, which had been deep discharged on several occasions. The other 3rd party battery (magenta line) was marked 1300 mAh, and indeed it has less capacity.
(Li batteries gain capacity when used for a bit, so I ran the Mugen through a few cycles before and during these tests.)
The real problem, though, is an inability to survive deep discharge. When I first purchased a Mugen battery, I put it in the N810, connected the charger, and then tried to boot the N810. Well, this is a mistake. I figured it would run off the charger, but apparently during the boot process the charger is cut off, and there was not enough juice in the battery to get through the boot.
But unlike the Nokia battery, the Mugen was unable to survive this treatment. It would not charge any more, either in the N810 (which refused to go into charge state) or in a third-party charger.
Mugen generously exchanged the battery. But the other week I inadvertently left the N810 with the Internet radio on, and ran the new Mugen battery down. That killed it.
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2009-10-12
, 01:06
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Posts: 145 |
Thanked: 33 times |
Joined on Dec 2007
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#34
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The software on the tablets should shut down before 3.2Volts though, but there are ways to disable that. I hope you didn't.
Not generally true for Li-Ion, though some manufacturers recomend it for LiFePo4 chemistries.
"The first time, please charge the battery in the device for at least 8 hours ... After fully charged, please use the device until the device tells you the battery is verly low, then recharge. Repeat this process for 2-3 more times, where after (sic) you can recharge the battery whenever is suitable. Important: NEVER drain the battery completely to 0%."
Originally Posted by bilofskyThat's a seriously defective battery. If the battery has been shipped empty, then it will have degraded seriously during storage and transport, to the point that it might even pose a safety hazard.The real problem, though, is an inability to survive deep discharge. When I first purchased a Mugen battery, I put it in the N810, connected the charger, and then tried to boot the N810. Well, this is a mistake. I figured it would run off the charger, but apparently during the boot process the charger is cut off, and there was not enough juice in the battery to get through the boot.
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2009-10-12
, 04:27
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Posts: 1,258 |
Thanked: 672 times |
Joined on Mar 2009
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#35
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George Fragos
Internet Coach & Writer
Maemo Mapper HowTo
Personal Blog -- 3 Joe's Blog
N810 -- 5.2010.33-1