Re: (ET) cordless electric mower

[David C Robie <mycroftxx1 juno com>]

YAH I had a nice bunch of flooded ex-railroad alkaline cells in my back
yard but one fine day came home turned on the rraddio and nothing. 
Somebody had stolen em all,  Likely to junk em.

We can't stop mfgrs from selling (or installing in equipment) substandard
batteries or chargers.  But we can stop buying em.  And did, judging by
the switch back to nicad.  
I have found that nicad AA's just don't have the poop to run my HP camera
for long, or the Enecessary to make nice bright 2 cell flashlights.  But
they are better than anything tried yet on the 3V portable CD player.

Dave
Weymouth MA
 

On Wed, 26 Jul 2006 11:55:17 -0400 "David Roden" <etpost drmm net>
writes:
> On 24 Jul 2006 at 21:33, David C Robie wrote:
> 
> > NIMHs   -  don't believe the hype.
> 
> Like anything else it depends on what you're doing with them.  
> Nicads can 
> take overcharge much better and I'd guess that's why the tool mfgs 
> went back 
> to them.  
> 
> Users want fast charges but low tool prices.  The mfgs bundle about 
> the 
> cheapest, crappiest junk chargers they can buy at low bid.  With 
> relatively 
> high charge rates (in some cases) and essentially no charge control 
> they 
> trash NiMH in short order, but nicads can stand this treatment 
> better.
> 
> Self discharge is higher on NiMH but not that much higher!  Cheap 
> cells or 
> failing cells *will* have bad SD though.  I use Nexcell/Powerex/Maha 
> and 
> sometimes Energizer NiMH for my digital cameras.  One of the cameras 
> sits in 
> my briefcase for weeks or months without being used, and only once 
> has it 
> let me down when I wanted it.  As I said, good cells are higher SD 
> than 
> nicad but not by *that* much.
> 
> NiMH is quite decent - better than nicad but not as good as lithium 
> based 
> secondary cells - where you need small size, low weight, lots of 
> energy on 
> board.  Darn few AA size nicad cells will yield a real world 2.2 ah, 
> but 
> NiMH can and does.  (Though high capacity comes at the expense of 
> cycle 
> life.)
> 
> I don't know how useful this exchange is to trakers since I doubt 
> that 
> anybody here is going to use NiMH in his tractor - but we do have a 
> couple 
> of people using nicads.  Flooded ones, that is - not AA cells!
> 
> 
> David Roden - Akron, Ohio, USA
> 
> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 
> Note: mail sent to the "etpost" address will not reach me.  To send 
> me a private message, please use "evadm at drmm period net."
> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> Americans are satisfied with things because they are large; and
> if not large, they must have cost a great deal of money.
>  
>                             -- Lepel Henry Griffin, ca. 1885
> 
> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =    
>     
> 
> 
>