Natural Science Forum / Chemistry / Electrochemistry / September 2004

I would like to estimate the tafel constants of three solutions
containing about 20% water in glycol. Can anyone provide any basic
guidelines for the expected value range of tafel constants in
predominately non-aqueous solutions? Thanks in advance.

Check this out:
http://biz.yahoo.com/prnews/040913/dam001_1.html
Regards,
Evgenij

If I have the Phase then say 40deg and the magnitude say 10 then how can I
convert that into capasitance.
I have the following circuit:
___SIGGEN_____

Is it a bad idea to use one brand of NiCad rechargeable battery in a
recharger made by another company?  Is there any danger in placing two
different brand NiCad batteries in the same recharger at the same
time?  Is it bad to place 2 different brands in a device?

I have sixteen surplus Maxwell Technologies PC 2500 2700 F 2.5 WVDC
ultracapacitors and had eight on road with an Ametek 30 VDC, 12 A stall motor
chain driven from the rear wheel of my bicycle, in series, with no balancing
resistors. I headed down a hill and that rig was sucking big ...

http://eshop.macsales.com/Catalog_Item.cfm?ID=7157&Item=NWTIPOD210012
It is a 3.7v 2100mah Li Pol battery and I know there has to be somewhere to
get it cheaper than $40.
Please e-mail me if you know of somwhere to look..

  I have a number of electronics that need charging at different
voltages (from 4.2 to 16V, 0.5 to 2.5 A needed). Because I'm planning
to take these things with me in the outdoors and only have an AA car
charger available I was thinking of putting a number of NiMH batteries

Wayne wrote:

Anyone dare to attempt to construct a Lithium-Fluorine battery? It would be
very difficult since you would need something to hold the fluorine in solution,
but fluorine reacts with almost anything.

Anyone have success with DIY process to plate chromium onto
titanium ?

Does anyone have any idea of what happens to NiMH when charged with
solar charges?  I am thinking about NiMH in a black plastic casing
with a solar panel to recharge.  I read that there are issues at temps
over 30C, and daytime temps can get up to about 45C external, and

Second-hand laptop (Thinkpad T22) arrives from ebay in fairly good
condition, except it won't run on battery power.
Symptoms:
I initially assumed it needed charging so left it on charge, however this

Having accumulated several devices using 3 AAA cells, I decided to begin
using NiMH instead of alkaline. (I've used NiMH in AA since they became
available, and NiCd in all common sizes long before that.)
My problem is getting them to charge completely.

Hi, I'm building a 11.1 2.4 ah li-poly battery back with gas gauge.
I'm using bq2084 as gaz gauge,SFD-127A (sc protector) as primary level
over voltage and current prtection, bq29400 as 2nd Level Over Voltage
Protection and bq29312 as battery protection AFE.