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Subject: charging algorithm dynamic max. duration
From: Uwe Freese (mail_at_uwe-freese.de)
Date: 2002-08-17


Hello Heikki,

And another idea (sorry, but I think the time will come I run "out of
ideas" in the near future ;) ):

Instead of using the static CHARGE_MAX_TIME of 6*60 min, i suggest:

- set a value max_time when starting charging:
  max_time = CHARGE_MAX_TIME * (100-battery_level()) / 100;
- change CHARGE_MAX_TIME to 8*60 min, because there exist 2000 mAh
  NiMh cells and I think I'll replace the standard 1500mAh cells. My
  recent charging of the 1500 mAh cells had a duration of 330 min.
- end charging, if (charged_time > max_time)
  
Effect:

- better max.-time-check, independant of how full the batteries are
  when starting charging
- time enough to charge 2000 mAh cells without the disadvantage that
  cells could generally charge too long (because of the new max_time)

P.S. The 'capacity behaviour tests' (see other mails) show that this
is not useful. The measured value was roughly the same the whole
charging cycle. So forget this idea.
  
Bye, Uwe.



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