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Rockbox mail archiveSubject: Re[2]: heatingRe[2]: heating
From: Uwe Freese <mail_at_uwe-freese.de>
Date: Thu, 19 Dec 2002 12:22:16 +0100 Hello Doug, Doug wrote on Thursday, December 19, 2002, 4:38:07 AM: D> - If the batteries are full, the charging current cannot charge the battery D> anymore. So the energy is absorbed by heating up the battery. D> - Each battery has a negative temperature coefficient, that means the voltage D> goes down when the temperature goes up. D> ----------------- D> As you can imagine, I'm not much of an expert on the charging algorithm, D> however I have an aching suspicion that this--barring any defect in my D> unit--was cause for the shutdown. D> Tell me if you think the properties of the batteries or the algorithm itself D> could have caused the batteries to drain because of the heat. The voltage goes down only some mV when the batteries get hot, not down under shutoff-voltage (it is about 1 V between max. and min. voltage). I don't think it's possible that the heat tricked the charging algo. Because the shutdown happened while deep discharge was off, I really think that something must be wrong with your unit. But I don't know, what. Bye, Uwe. Received on 2002-12-19 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |