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
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