Subject:
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Re: Rechargeable Batteries
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 6 Aug 2001 21:37:54 GMT
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Original-From:
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Pink Tail <pinkmice@borg.com%saynotospam%>
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Viewed:
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1579 times
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I have been interested in what people have to say about
using 1.2v cells instead of 1.5v.
I don't think the RCX minds, but what is a problem to my mind
is that after the RCX motor drivers drop about a volt from the
already low 7.2v, you end up running the motors at ~6v instead
of their 9v design voltage. I like to get every last bit of umph from
my motors, so after you see how they can perform directly from
a 9v battery pack, it makes you need all the volts you can get.
That's why I went to the trouble to build an external MOSFET
motor driver amplifier thing. Of course if your not trying to build
big bots using non-Lego treads (deathly hush comes over the
crowd ;) it may not be quite so much of an issue.
John Barnes
> In lugnet.robotics.rcx, Roger Glassey writes:
> > Jerry:
> > What is the problem with the NiMH batteries? the low voltage? Or extra • $$ ?
> > Roger
> >
> > In lugnet.robotics.rcx, Jerry Kalpin writes:
> >
> > > Frank, I would *not* use Nicads or NiMH rechargeables. Their • full-charge
> > > voltage is about 1.25V while alkaline batteries are about 1.55. I have
> > > Ray-O-Vac Rechargeable Alkaline batteries. They last several hours of
> > > operating time between charges, which for me is a few weeks (adequate
> > > performance). I have two sets of six and a charger, an investment of • about
> > > CAN$60.
>
> Roger, I believe the low voltage is more important. A side issue is the
> battery indicator that you access through NQC (or Robolab) set up in a • scale
> of 0-9 volts. Fully charged alkalines are 9+ and discharged ones are 6
> volts. With NiMH full charge would be 7.2 and discharged would be • somewhere
> around 6. The discharge curve is fairly flat. You don't get much warning
> when they are about to die.
>
> I bet NiMH batteries would function OK in the RCX. If you already have • NiMH
> batteries, try them out and see. I just believe rechargeable alkalines,
> such as Ray-O-Vac Renewals are a better choice...!
>
> Jerry
>
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