20 min battery

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    • October 24, 2002 at 1:40 pm #9395
      Admin
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      i want to know if this battery works as it says

      it is a battery that a guy is selling on ebay, he says that it lasts for 20 min with 2 45 second charge, he says that it is 120 mha

      is this possible or have any of u guys bought this and does it work as it claims

    • October 24, 2002 at 1:43 pm #15955
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      Yes it is, but its quite possible to get 20minutes out of the standard nicad, if u use a stand alone* charger.

      *my car ran for 20 mins cont. when charged with electronic stand alone charger.

    • October 24, 2002 at 4:33 pm #15986
      PandaBear
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      I’m trying to get some 120mAh NiMH cells in – as soon as I’ve rounded up enough takers to put in a wholesale order.

      Pricewise I’m hoping will be about A$6 ea., + postage.

      Interested?

    • October 27, 2002 at 6:23 am #16158
      z-beam
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      Nimh is the phuture of bit chargin’

    • October 27, 2002 at 6:24 am #16159
      z-beam
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      Nimh is the phuture of bitchargin’

    • October 27, 2002 at 8:21 am #16169
      Trueno
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      Hey Guys,

      Do these NiMH batteries have any negative effects?

      Also, do you just clip them onto the controller twice for a double charge?

    • October 27, 2002 at 8:46 am #16171
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      How much does a stand alone charger cost in US $? Thanks

    • October 28, 2002 at 12:16 pm #16245
      PandaBear
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      Quote:

      Originally posted by Trueno on 27October2002

      Do these NiMH batteries have any negative effects?

      Nup. Just twice the capacity in the same space; it should be a direct drop in replacement.

      But its a DIY mod, so if you’ve got no confidence and you’re totally clumsy with huge hands, you *could* kill your Bit by opening it up. :smiley2:

      Quote:

      Originally posted by Trueno on 27October2002

      Do these NiMH batteries have any negative effects? Also, do you just clip them onto the controller twice for a double charge?

      Yup. Or there’s also a handy mod at QFM, which I’ve recently revised to make it even cooler… some pix coming soon (as soon as I’ve got them uploaded, soffy folks).

    • October 29, 2002 at 7:13 am #16289
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      I think the future of bits is the new aerogel capacitors….2000 times the volumetric capacitance of electrolytics……

    • October 29, 2002 at 9:03 am #16306
      PandaBear
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      Would capacitors really have enough capacity to run electric motors?

      Otherwise the other way is lithium polymer “bag” batteries… tinfoil bag can be squished into any shape you want. They’re used in new mobiles these days, but they do need sophisticated charging techniques.

    • October 29, 2002 at 10:03 am #16312
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      I didnt say capacitors..i said AEROGEL CAPACITORS

      Yesh but with lithiums they take many hours to charge. Caps take….well theycan pretty much beinstantaneously charged.

      Wish they had nimhs that you could squish into any shape. theres a fair bit of space wasted by ’round batteries’. and there i a fair old bit of space in the bcg chassis.

    • October 29, 2002 at 10:34 am #16317
      PandaBear
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      Traditionally capacitors aren’t really much good at passing current… sure you can charge it up quick and to high voltages, but the current is dumped pretty quickly too. Can get huge 1F (=1000000000uF) ones the size of 1L carton of milk for your car stereo, but they’ve got barely enough power to turn a electric motor.

      Plus the Voltage is directly proportional to the charge level… :smiley6:

    • October 31, 2002 at 5:16 am #16402
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      nononono…5.5volt supercaps have huge capacitance, and they use them in planes, the new aerogel capacitors are designed as hybrid battery packs.

      The new aerogel supercaps, are the best ones yet.

    • November 1, 2002 at 12:04 pm #16489
      PandaBear
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      Hmm!

      How big & heavy do they have to be, to be equivalent of the 50mAh cell?

      And given they’re capacitors… they don’t need any special charging techniques right?? just hook it up to voltage.

      Just imagine it… how about a BCG refilling station, with pads on the floor. Drive in, voltage is picked up via AFX brushes, drive out.

    • November 5, 2002 at 8:29 am #16698
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      Yeah, they make tiny little wafer thin ones which are 1F (1000000 uF)

      and there is lots of can types which are quite high 5F.

      Yep chaarging is almost instantaneous.

      Can you say’Le Mans 24 Hours’?

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