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NNTP-Posting-Date: Wed, 27 Nov 2002 10:29:40 -0600
From: "Dave VanHorn"
Subject: Re: Questions on building a battery charger
Date: Wed, 27 Nov 2002 11:30:16 -0500
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> If C/10 is bad, is there any reason I can't put in a shunt resistor
> across the battery to adjust the trickle current? The circuit already
> has a diode going to the battery, so the worst it could do is not
> trickle charge, but it won't discharge the battery. The shunt
> resistor would go before the diode, straight off the transistor and go
> to the sening resistor. Is it a problem if this resistor is sized so
> that no trickling occurs? Isn't there sufficient overcharge to
> equalize the cells before charge ends? Is oxygen only recombined when
> charging goes on, so an abrupt charge termination without trickling
> would leave the cell under pressure, or will the oxygen recombine
AND WHAT ABOUT NAOMI!? :)
So many questions.
In theory, you could add a resistor to shunt the excess trickle current.
I'm not sure what effect this might have on the charger during high rate
As to overcharge and oxygen recombination, that shouldn't be happening
(much) if the current is low enough. Oxygen recomb happens whenever there's
oxygen available. The trickling does not cause or help the recombination.
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