Subject:
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Re: Overcharged battery?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 15 Mar 2000 22:49:58 GMT
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Reply-To:
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kevin@dime&IHateSpam&.engr.trinity.edu
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Viewed:
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1412 times
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On Wed, 15 Mar 2000 17:06:25 GMT, Fred G. Martin <fredm@media.mit.edu> wrote:
> when fully charged and with no load it is not unusual to measure 10 to
> 11v on a nominal 9.6v pack.
OK, this is good to know.
> re: adding a drop resistor in series with the servo pwr, it should not
> be necessary, that is the purpose of the large 3 ampere drop diodes.
Yes, *if* more drop is necessary, more rectifier diodes would be called
for (i.e. relatively fixed voltage drop), not a series resistor (v=iR).
> kevin, if you would, please add a load (10 ohm 5 watt resistor e.g.)
> and let us know the measured voltage.
I didn't have any 5watt resistors handy, so I put a pretty generic DC motor
on there as a load. It dropped it to 6.3 volts (the classic 0.7/diode),
which is still a bit higher than I expected (aren't standard servos nominal
5V? -- I was told that >6v would blow them...), but probably not enough to
blow the servo (?).
Thanks,
Kevin Nickels
--
Kevin Nickels <kevin@dime.engr.trinity.edu>
Assistant Professor, Engineering Science
Trinity University, San Antonio TX, USA
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Message is in Reply To:
 | | Re: Overcharged battery?
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| no i disagree with this answer. the HB is designed to be left on normal charge indefinitely. the batts can get a little warm. if they are hot then something is wrong, but a little warm is nothing to worry about. when fully charged and with no load (...) (25 years ago, 15-Mar-00, to lugnet.robotics.handyboard)
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