Comments on: Battery Test 2 http://groklab.org/handhygiene/2010/02/24/battery-test-2/ Just another Groklab.org weblog Mon, 28 Nov 2011 02:43:21 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: tedherman http://groklab.org/handhygiene/2010/02/24/battery-test-2/comment-page-1/#comment-126 tedherman Fri, 26 Feb 2010 22:03:07 +0000 http://groklab.org/handhygiene/?p=645#comment-126 The current Pager program is set to shut down at a voltage below an ADC reading of 2000, though 2200 or even 2300 might be a better choice. I picked 2000 because the previous graph seemed to suggest that 2000 is near 3v, and some web pages that talk about Lithium Ion batteries say that a battery becomes damaged if you run it under 3v. I'm not sure who to believe on this. Examples of chatter: http://www.candlepowerforums.com/vb/showthread.php?t=250934 http://forums.anandtech.com/showthread.php?t=2019518 I've seen several times the claim that you should not drain below 3v. The current Pager program is set to shut down at a voltage below an ADC reading of 2000, though 2200 or even 2300 might be a better choice. I picked 2000 because the previous graph seemed to suggest that 2000 is near 3v, and some web pages that talk about Lithium Ion batteries say that a battery becomes damaged if you run it under 3v. I’m not sure who to believe on this. Examples of chatter:

http://www.candlepowerforums.com/vb/showthread.php?t=250934

http://forums.anandtech.com/showthread.php?t=2019518

I’ve seen several times the claim that you should not drain below 3v.

]]> By: gthomas http://groklab.org/handhygiene/2010/02/24/battery-test-2/comment-page-1/#comment-123 gthomas Wed, 24 Feb 2010 16:30:21 +0000 http://groklab.org/handhygiene/?p=645#comment-123 Great work, Greg. I'm glad you checked on the batteries the next day to see what happened to them. It may be that they don't completely turn off, just that they turn off most of their functions. I would have thought that their power drain was so slow that they wouldn't be at zero the next day, however. Perhaps we should shut them off a little earlier, before they get into the steep descent part of their curve. As for the difference between the 3.2v and 2.5v readings, I wonder if the battery voltage drops when sourcing a current when the battery is mostly depleted. Great work, Greg. I’m glad you checked on the batteries the next day to see what happened to them. It may be that they don’t completely turn off, just that they turn off most of their functions. I would have thought that their power drain was so slow that they wouldn’t be at zero the next day, however. Perhaps we should shut them off a little earlier, before they get into the steep descent part of their curve. As for the difference between the 3.2v and 2.5v readings, I wonder if the battery voltage drops when sourcing a current when the battery is mostly depleted.

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