Natural Science Forum / Chemistry / Electrochemistry / October 2005

I don't use my cordless drill that often, but it ir real handy sometimes
since I live on a farm.  Unfortunately the batteries don't seem to last
very long, maybe 2 years or so; I think the recharger is cooking the
batteries and ruining them.  I would like to find a ...

Dears,
At the company I work for we use some powertools (in this special case
a strapping tool) that use 2.4Ah NiCd sub-c type cells. I could not
figure out if they are from Sanyo or some other manufacter.

When simulating AC voltammograms (absolute admittance vs. DC potential)
one should account for a spherosymmetrical diffusion (in case of a
spherical electrode) by placing a resistance with a value
r0*(sigma)i*(2/Di)^.5 in parallel with the Warburg impedance of species

I'm looking for a small rechargable battery.
It should last several months without losing all its charge at 30C or so
ambient.
Staying charged is more important than ultimate capacity, though more capacity

Guys,
I currently have a gel optima red top in my truck and want to install a
gel optima yellow top as backup and accessory battery, which would
often be drained...

Greetings...
I saw, on the internet, a device using capacitive discharge  where you can
discharge the capacitor and the resultant high current will fuse the metals
together..eg to the positive and negative ends of two batteries to put them

From my previous question:
"I am a cyclist and I use a Trelock LED cycle light which uses 5 x AA
batteries. It has the ability to recharge the batteries using a mains
charger which plugs directly into the light and saves the batteries having

I just finished working on a number of UPSs.
One thing I noticed was that many of the Sealed Lead Acid (SLA)
batteries were swollen and hard to remove.
Why do SLA batteries swell?

As most of you have already talked about, I have seen many batteries with
links, fusing, or welding, them together...
Does anyone know how this is done?...what current, etc, is used...
larry

H2O(aqu) + 208kcal --> H+H+O(gas) +208kcal --> H2O(aqu)

I would be interested in hearing a recommendation for a charger for
lead acid batteries.
I am looking for a charger that gives an indication of charging status
(no idiot lights please), capability for flooded cells, sealed lead

I am a cyclist and I use a Trelock LED cycle light which uses 5 x AA
batteries. It has the ability to recharge the batteries using a mains
charger which plugs directly into the light and saves the batteries having
to be removed to recharge. I am using 5 x 1300 NiMH AA batteries. The ...

I am a hobbyist that would like to build my own battery tester. I have a
data logger that will record the voltage over the test time, but I'm not
sure of the test load I should use. I don't want to discharge a battery to
fast as I'm not sure of the damage that might be done to it ...

Hi to all, first i'm sorry for my english and i hope that you don't mind
about grammatical errors.
My idea is this: i want to connect in series 20 vehicle standard Pb
batteries (12v , about 50 Ah) to make a sort of  "emergency battery" for a

Just out of curiousity, is there a method of producing iron powder
using electrolysis?  I read (on I think sci.chem) about using a
saturated solution of some iron salt and water, and electrolysizing at
high current (120 amps/sq. meter?), would produce iron powder.  I