Rockbox Development > Feature Ideas
Battery management while charging
blr_p:
--- Quote from: torne on October 21, 2012, 01:29:07 PM ---The information you link to does not support your conclusions (in fact, they agree with me) :)
--- End quote ---
How so ?
Post Merge: October 21, 2012, 04:02:51 PM
--- Quote from: saratoga on October 20, 2012, 09:01:42 PM ---If batteries are really good for so many charge cycles as that chart suggests then I don't think this setting makes sense.
--- End quote ---
You get as many cycles only if you take care of the batteries.
saratoga:
1000 100% charge cycles with basically no loss of capacity suggests that shallow discharging isn't really useful.
blr_p:
Ah but the first chart does not say anything about how charging was performed. The assumption is the batteries were placed in an analyser and charged/discharged repeatedly. The point of the chart was to rebut torne's assertion that charging per se is detrimental.
The basis on which he made that statement still remains outstanding.
Also why do the BU docs take the trouble to explain in the Li-ion sectoin HOW the charging should be done to preserve battery life. These later points are what i've highlighted, and are all linked in my first post.
You want to comment on them ? ;)
My goal here is to establish the concept that not charging to 100% and partial charges are better than charging to 100% and letting the unit run flat.
This is what a company whose bussines it is to test batteries has to say. Anyone who wants to counter that with sources of their own, go ahead. But general disagreement isn't really refuting what i've said , quite the contrary.
torne:
--- Quote from: blr_p on October 22, 2012, 07:49:39 AM ---Ah but the first chart does not say anything about how charging was performed. The assumption is the batteries were placed in an analyser and charged/discharged repeatedly. The point of the chart was to rebut torne's assertion that charging per se is detrimental.
--- End quote ---
The *chart* doesn't, but the article that contains it does indeed say that it's referring to full discharge/full recharge cycles. Also, the chart shows capacity dropping off with number of charges.. so it doesn't rebut my claim at all.
--- Quote ---The basis on which he made that statement still remains outstanding.
Also why do the BU docs take the trouble to explain in the Li-ion sectoin HOW the charging should be done to preserve battery life. These later points are what i've highlighted, and are all linked in my first post.
You want to comment on them ? ;)
--- End quote ---
I never disagreed with any of the things BU claim; I just noted that they don't make much measurable difference with batteries in regular consumer electronics, and that therefore it's probably a waste of time to implement a more complex charging scheme that gives people less runtime.
--- Quote ---My goal here is to establish the concept that not charging to 100% and partial charges are better than charging to 100% and letting the unit run flat.
--- End quote ---
I never said it wasn't, just that it's not very important. Please read more carefully.
torne:
I think the point you're missing is that if your suggested regimen is to charge to 70% and then only let it discharge down to 45%, you are throwing away a huge amount of your runtime *anyway*. In a couple of years time, your battery will probably be in better condition than someone who hasn't done that, but you haven't *gained anything* by doing so: their battery, even used randomly for the same length of time, probably has more 100-0% runtime than yours does 70-45% runtime :)
My ipodvideo's battery has not been replaced since the device was made in 2006, was used by someone else before me, and neither I nor the previous owner took any care over its battery whatsoever. When I got it halfway through its life, it lasted for 22-23 hours; it now lasts for 21-22 hours. If I only used it 70%-45% then even with a brand new battery I'd get way less runtime.
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