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Re: Li-Polymer Batteries

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On Sat, 21 Oct 2017 14:53:31 -0400, rickman <gnuarm@gmail.com> wrote:

>krw@notreal.com wrote on 10/21/2017 10:48 AM:
>> On Fri, 20 Oct 2017 23:23:20 -0400, rickman <gnuarm@gmail.com> wrote:
>>
>>> krw@notreal.com wrote on 10/20/2017 11:03 PM:
>>>> On Fri, 20 Oct 2017 22:54:41 -0400, rickman <gnuarm@gmail.com> wrote:
>>>>
>>>>> krw@notreal.com wrote on 10/20/2017 8:05 PM:
>>>>>> On Fri, 20 Oct 2017 04:56:50 -0400, rickman <gnuarm@gmail.com> wrote:
>>>>>>
>>>>>>> Jan Panteltje wrote on 10/20/2017 3:48 AM:
>>>>>>>> On a sunny day (Thu, 19 Oct 2017 18:34:47 -0400) it happened rickman
>>>>>>>> <gnuarm@gmail.com> wrote in <osb9a9$v5o$1@dont-email.me>:
>>>>>>>>
>>>>>>>>> Interesting.  Both videos use a lot more battery than I will use and the bag
>>>>>>>>> is barely closed.  I would be essentially rolling the bag up and depending
>>>>>>>>> on the size I use I would be folding the sides over before rolling.
>>>>>>>>
>>>>>>>> You have to leave some opening so the smoke can escape and the pressure can
>>>>>>>> be prevented to build up to a point where the bag tares.
>>>>>>>
>>>>>>> Yes, but some opening is not the gaping holes in these bags.  The other
>>>>>>> video with a bunch of batteries in a latched and sealed ammo case is pretty
>>>>>>> instructive.  Before it broke the seal it actually dented the can with the
>>>>>>> pressure.  But like I said earlier, one cell of Lipo is not nearly as much
>>>>>>> energy as the videos show.
>>>>>>>
>>>>>>> If I could find similar products to the power bank boards that worked with
>>>>>>> NiMH, I'd go that route.  I believe they actually prefer NiCad in power
>>>>>>> tools because of the high current.  NiMH has too much internal impedance.
>>>>>>> But this will only draw a couple hundred mA most likely, so it would be a
>>>>>>> good fit.  I would have to roll my own design for the whole thing.
>>>>>>
>>>>>> Not sure where you going with your comment that "they" prefer NiCad in
>>>>>> power tools.  "They" (manufacturers) make almost[*] 100% LiIon tools
>>>>>> these days.  LiIon is a hands-down winner in this application, even
>>>>>> though they scare you.
>>>>>
>>>>> The context was compared to NiMH.
>>>>
>>>> Gotcha.  Is anyone still making NiCD or NiMH tools?  I haven't seen
>>>> any in a long time.
>>>
>>> Don't know.  It's been too long since I dug into hand tools much.  I
>>> remember having an RC boat which ran ok on alkaline cells.  Then I got
>>> rechargeables for it and it TOOK OFF like a rocket.  Seems the lower
>>> resistance of the NiCd made a big difference.  But it only ran for five
>>> minutes, lol.
>>
>> Most stuff designed for Alkalines ran like crap with NiCds, due to the
>> lower voltage.  Some stuff didn't run at all (UVLO).  NiCds also have
>> a horrible self discharge and short life, particularly multi-cell
>> packs if not kept charged.  A real bad combination for tools.  LiIon
>> fixes all that.
>
>Self discharge for sure.  But I don't know about the short life. 

You bet!  A LiIon will still be good after five years sitting on a
shelf.  Try that with a NiCd.  You're lucky if you get one.  I never
have, even with "high quality" rebuits.

> I have a 
>Makita power tool with NiCd batteries and that thing ran for 15 years before 
>the battery wouldn't charge.  It was often left laying around uncharged so 
>it wasn't pampered either.  I was amazed.  A new battery pack costs as much 
>as a new tool with Li-ion.  Actually, I think the tool I replaced it with 
>*also* used NiCd, to my surprise and it crapped out after a much shorter 
>time.  Finally I got a hammer drill with Li-ion and all is good.

That was true with NiCd, too.  Cost <> price.  

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Thread

Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-16 10:16 -0400
  Re: Li-Polymer Batteries Mark Storkamp <mstorkamp@yahoo.com> - 2017-10-16 12:47 -0500
    Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-16 20:49 -0400
  Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 01:30 -0400
    Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 02:28 -0400
    Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-17 08:13 +0000
      Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 05:21 -0400
        Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-17 09:47 +0000
          Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 06:18 -0400
            Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-17 10:26 +0000
              Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 06:33 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-17 15:31 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 16:52 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-18 07:12 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-18 04:58 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-18 09:29 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 16:53 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-18 07:12 +0000
                Re: Li-Polymer Batteries mike <ham789@netzero.net> - 2017-10-17 12:07 -0700
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 17:19 -0400
                Re: Li-Polymer Batteries mike <ham789@netzero.net> - 2017-10-17 20:03 -0700
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 23:36 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-18 17:49 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-18 16:42 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-19 09:11 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-19 10:53 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-19 15:22 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-19 12:18 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-19 16:47 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-19 18:34 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-20 07:48 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 04:56 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-20 09:38 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 12:47 -0400
                Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-20 17:00 +0000
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 13:45 -0400
                Re: Li-Polymer Batteries krw@notreal.com - 2017-10-20 20:05 -0400
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 22:54 -0400
                Re: Li-Polymer Batteries krw@notreal.com - 2017-10-20 23:03 -0400
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 23:23 -0400
                Re: Li-Polymer Batteries krw@notreal.com - 2017-10-21 10:48 -0400
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-21 14:53 -0400
                Re: Li-Polymer Batteries krw@notreal.com - 2017-10-21 19:49 -0400
                Re: Li-Polymer Batteries Jasen Betts <jasen@xnet.co.nz> - 2017-10-27 22:47 +0000
                Re: Li-Polymer Batteries krw@notreal.com - 2017-10-27 22:25 -0400
                Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-19 12:51 -0400
            Re: Li-Polymer Batteries Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-10-17 21:05 +0100
    Re: Li-Polymer Batteries TTman <kraken.sankey@gmail.com> - 2017-10-17 16:02 +0100
      Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 17:37 -0400

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