Re: Li-Ion Life

ptaylor wrote:
> browntimdc wrote:
>
> > "Glen F" <[EMAIL PROTECTED]> wrote in news:Bhbxb.2741
> > [EMAIL PROTECTED]:
> >
> >
> > > What cycle life and elapsed time life would you expect from typical
> > > small Li-Ion consumer packs?  Over on one of the photography groups,
> > > typical lifetimes as short as 2 years are being claimed, even on
> > > the shelf.  Seems unlikely.  Comments?
> >
> >
> > If the batt sits in a hot laptop computer two years is reasonable.
> >
> > Tim
>
>
>
>  I found a bunch of "dead" Li-ion packs from old laptops.The Li-ion 
> cells inside were fine,but I think the "smart" cicuit inside gave up the 
> ghost. So I wired them in packs of four. I now have (ermm 1350mah x4) 
> 5.4AH @ 14.4V for a small transmitter.It should run for a few days 
> before needing to be recharged. ;-)  4 paralell packs of 4 cells in 
> series.I have a diode between each pack and "output" and a 150ohm 
> resistor in paralell with the diode to "trickle" charge the packs. I 
> just connect it to ~ 12vdc (or the solar panel),and let it charge.. 
> Probably not quite the "ideal" way to charge them,but the old cells 
> havn't failed me yet!

Seriously, you should read up on now (not to) charge Lithium batteries.
And put on your safety glasses.
mike


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