On Mon, 23 Jun 2008 22:46:24 -0500, Kris Krieger <me@[EMAIL PROTECTED]
>
wrote:
>"Tom Biasi" <tombiasi***@[EMAIL PROTECTED]
> wrote in
>news:SN6dnboY57y6pf3VnZ2dnUVZ_gCdnZ2d@[EMAIL PROTECTED]
>
>>
>> May I suggest deep cycle sealed lead acid.
>>
>> Tom
>>
>
>My main question is, are they easily replaceable? THey do seem to be
>easier to deal with, but these units are going into things that I'll
>(hopefully!) be selling, so I need to make it all as easy as possible,
and
>I know that people can buy the NiMH batteries pretty easily. That's the
>only reason I've sort-of "fixated" on them. THat, and it's easy to get
the
>mA ratings that will drive the LEDs I want to use (found one that uses 20
>mA, and 3.4V average, but gives out an amazing (to me) average of
>18,000micro-candela, which is 226 lumens, which is a bit more than is
given
>off by a 20-watt incandescent bulb (220 lumens). With the LED driver (I
>think it was you who'd recommended those), that should work out well and
I
>could, I think, use two such LEDs, which should be about the lumens
>produced bya 40 watt incandescent bulb - which would be super!
>
>Anyway, I haven't seen any drivers that I can recall reference running
off
>of anything other than NiCad, NiMH, or Lithium-Ion batteries,so my
>impression was that those are the only two that have both enough voltage,
>and generate enough current, to run the drivers. I've also used store-
>bought solar lights, which had either NiCad or NiMH (depending upon th
>etype), so I know those will work when left outdoors.
>
>So, it might very well be that rechargeable lead-acid bnatteries can
>perform similarly, it's just that I don't know anything about them...
>
>- Kris
>
Lead-acid batteries are normally large and heavy. Your car battery is
lead-acid, for example (although there are smaller sizes, and some
variations that don't have a liquid electrolyte, available). If you
are considering AA, C or D cells for your project, lead-acid batteries
are almost certainly not a consideration. I'm not aware of any
lead-acid batteries in a "dry cell" format.
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
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