Natural Science Forum / Chemistry / Electrochemistry / May 2004

I have been reading your group for a little while. I thought I add and
correct a few comments made about my dad, Lewis Urry.
First of all, he invented all of his patents via Energizer, Eveready,
Union Carbide Corp, never ever in a garage at home. No dad isn't a mad

Have you ever considered how much batteries cost compared to household
electricity? At an average of $800 per kWh, batteries are almost 10,000 times
more expensive!
Battery companies are definitely committing Price Fixing.

Im pretty clear (I think) on the electrochemical mechanism of the
formation of iron rust. I understand that the iron undergoes
oxidation, and that the oxygen in the water reduces to form hydroxide,
thus forming an insoluble precipitate.

How do you tell when a battery is fully charged, for example, if you want to
give your car battery a boost once in a while, or some old rechargeable
batteries you've not used for some time, and they have become completely
flat.  How do you estimate how long you should leave them on ...

What is the depth of discharge vs. expected cycle life relationship for
Li-Ions?
Any good source for this data?
I am most interested in "standard" (=most mass produced, highest energy

I intend to build a wearable video camera & transmitter worn in a hat.  The
present draft design includes two Kokam LiPoly battery packs attached to the
hat.  Will this be safe if I:
1) Ensure that short circuiting is impossible

I need a circuit to build a Charger for my 18 volt drill battery .
Thanks
Jan

All batteries are rechargeable and "Rechargeable Batteries" are a scam, don't
you think?

Does anyone  if anyone at Kuhmo is available to sell the software
MEISP.
For the last 2 months, I have not been able to get a response from the
suggested contact person at <kans@mail.kkpc.re.kr>.

I've been reading about the technology that is used in the portable
Breathalyzers that are carried by cops. It seems that the most
reliable technology involves the use of a fuel cell containing
platinum electrodes and an acidic eltrolyte solution. When the ethanol

I've been wondering about electrolysis as it occurs in 'real life'. This is
more of an engineering question, than a 'pure science' question. I add two
'real world' complications to the basic electrolytic-process model.
Example would be a water tank in cyclical use. The tank has ...

New to this, but not Nicads or NiMH.
Just bought a minidv camcorder (Canon Optura 20) one week ago and am
setting it up. Don't even have my tapes yet, so can't shoot, but will
have tapes in couple days. Right now, I'm investigating various issues,

                    Cracow, 17.05.2004
Hello,
In the Bard and Faulkner book (Electrochemical Methods, Wiley 1980)
there is a discussion of electrode kinetics based on the consideration

Looking for recommneded vendors of inexpensive 18650 li-ion cells.

I think they should make Lead acid batteries for common consumer devices (such
as CD players, remote controls, smoke alarms, computers, or anywhere you might
want to use a rechargeable battery) what do you think?