And Ni-Cds have even more peak amps - at the cost of environmental
pollution with the heavy metal cadmium, more weight, and less
capacity. Was great for quick flash recycling....
tOM
On 18 Sep 2005 at 21:06,
C.H.Ling <olympus@xxxxxxxxxx> wrote:
>
> As far as I know the most common Li-ion rechargeable cells are at
> 3.6V and Ni-MH is 1.2V (2.4V for two). There is 50% different in
> voltage, for 1300mA (Li-ion) and 2100mA (Ni-MH) the different is
> 61.5%, actually you can get 2400mA Ni-MH easily at very low cost.
>
> For the discharge character, all I heard were Ni-MH has higher
> discharge capability then Li-ion. The normal discharge voltage of
> Ni-MH is 1.2V at 1C and Li-ion is 3.6V at 1C. Panasonic, one of the
> biggest battery supplier shown max. 3C discharge curve on their
> handbook and only 2C for Li-ion, they also request OEM manufacturer
> to contact them for application of discharge over 1C.
>
> Here you can found details technical specification about
> rechargeable cells:
>
> http://www.panasonic-industrial.com/servlet/PB/menu/1043239_l2/index
> .html
>
> C.H.Ling
>
> ----- Original Message -----
> From: "Tim Hughes" <timhughes@xxxxxxxx>
> To: <olympus@xxxxxxxxxx>
> Sent: Sunday, September 18, 2005 5:28 PM
> Subject: [OM] Re: E10 quirks--just me?
>
>
> > In a previous post I calculated the Energy capacity of Li-ion
> > CRV-3's, and said it was modestly more than the NiMh's. I had
> > assumed they were conventional Li-ion cells with a Li-cobalt
> > cathode, I was wrong , they appear to be Li-phosphate cells. The
> > conventional Li-Co cells have a nominal voltage of about 4.1V.
> > In fact the CRV-3 rechargeable is a replacement for a 3V primary
> > cell, so it uses a different cathode to produce a lower nominal
> > voltage (around 3.25V). This results in a significantly lower
> > energy. On the face of it they will have a lower capacity/lower
> > run times than the high capacity NiMh cells. (as pointed out by
> > CH). As I pointed out previously though, users report much
> > better results from these CRV-3 rechargeables than from Nimh.
> >
> > In general the lower voltage (~3.2V) Li-ion rechargeable batteries
> > using phosphate cathode materials, are not common (except maybe
> > CR3V's ??) and are not popular because the energy density is much
> > lower than the the ~4.1v cells. However, they have some desireable
> > characteristics which may help in this case: They can generally
> > deliver much higher peak currents and have better cycle life. The
> > high peak current and flat discharge curve may help in this case
> > to increase run time.
> >
> > Regards,
> > Tim Hughes
-- Quidquid latine dictum sit altum viditur --
,__@ tOM Trottier
_-\_<, 758 Albert St., Ottawa ON Canada K1R 7V8
(*)/'(*) N45.412 W75.714 +1 613 231-6115
<a href="http://Abacurial.com";>Abacurial Information
Architecture</a>
Q, Q,
</ </ I would rather be exposed to the inconveniences
(`-/---/-') attending too much liberty than to those attending
~~@~~~~@~~~~~~ too small a degree of it.-Thomas Jefferson
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|