Re: Another Novice Q. - recharging - Volts and Amps

On Mon, 23 Jun 2008 22:46:24 -0500, Kris Krieger <me@xxxxxxxxxx>
wrote:

"Tom Biasi" <tombiasi***@optonline.net> wrote in
news:SN6dnboY57y6pf3VnZ2dnUVZ_gCdnZ2d@xxxxxxxxxxxx:


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
.