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Rockbox mail archiveSubject: Re: some Ideas about Batteries in PowermanagemantRe: some Ideas about Batteries in Powermanagemant
From: Uwe Freese <mail_at_uwe-freese.de>
Date: Sun, 19 Jan 2003 22:38:12 +0100 Hello Holger, Holger Lembke wrote on Sunday, January 19, 2003, 8:34:50 PM: HL> Ok, the story. My AJBR has a distracting capacity display. If I start using HL> it, it has 100%. Then the capacity display drops rather fast to something HL> around 60%. It falls slowly to 40% and 30% sometimes comes back and than HL> quickly falls down to low percentages and my AJBR stops working. These quick changes aren't usual. Your batteries or your unit could be broken! HL> After looking at HL> http://www.stud.uni-karlsruhe.de/~usng/rockbox/ladeverfahren.html and HL> looking at 'static int percent_to_volt_decharge[11]' I think it is easy to HL> see why it is this way. HL> The voltage values simply dont give the resultion to get a better idea HL> about the capacity at the flat part of the discharge curve. The "resolution" is enough. In the middle part of the courve, the voltage has a linear form there. HL> If this is right, could there be a better way of showing the capacity? HL> Is it possible to calculate it by runtime? Simply have a thread that HL> checkes the on/off state energy consuming items (hdd, backlite etc), knows HL> the drain and capacity and does some math? I also had this idea some months ago. I already started to write a test version of this kind. But I rejected this idea after some tests. If you charge/uncharge the batteries completely every time, it may work. But if you charge/decharge only litte amounts, it will drift off very quickly. HL> Or use the history (that from charging) for a better calculation? In which way? If you have ideas, let us know. Bye, Uwe. Received on 2003-01-19 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |