Support and General Use > Hardware

Battery preservation (esp for clip+)

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saratoga:

--- Quote from: lorriman on March 10, 2011, 05:27:58 PM ---Saratoga, since my claim contradicts yours here is a reference :

http://batteryuniversity.com/print-partone-19.htm

Wikipedia summarises this as follows:

"A Standard (Cobalt) Li-Ion cell that is full most of the time at 25 °C (77 °F) irreversibly loses approximately 20% capacity per year. Poor ventilation may increase temperatures, further shortening battery life. Loss rates vary by temperature: 6% loss at 0 °C (32 °F), 20% at 25 °C (77 °F), and 35% at 40 °C (104 °F). When stored at 40%–60% charge level, the capacity loss is reduced to 2%, 4%, and 15%, respectively." http://en.wikipedia.org/wiki/Lithium-ion_battery#Cell_life

--- End quote ---

Maybe I'm confused about what you want to accomplish, but I don't think thats what you're talking about.  Thats for storage, which would mean a player you wanted to put on a shelf and never use.  Since you said this:


--- Quote from: lorriman on March 10, 2011, 05:27:58 PM ---I'm not too worried about the average user: for me a 50% max charge gets me roughly 7 hours of playback and a battery that will last much much longer.
--- End quote ---

I don't think that text really applies to your use case.  Instead you probably want to read this:

http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries


--- Quote from: lorriman on March 10, 2011, 05:27:58 PM ---The level of max charge could be user selectable: even a 60% max charge (15% pa preservation) I think is worthwhile and practical.
--- End quote ---

This isn't something we really want to expose to the average user.  Someone familiar enough with battery charging can just adjust the parameters in their own builds. 

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