Natural Science Forum / Chemistry / Electrochemistry / November 2005

I've been told that you should never add acid to a lead acid battery.
Obviously if you tip the battery over and spill the acid out you will need
to add some, but how much? At what concentration?
Are there any other conditions where you would want to add additional acid

Good day... I have a Craftsman 12V Cordless Drill, with Ni-Cd battery
cells. When the battery is completely drained and then placed in its
charger, it will not charge. However, if I first connect the battery to
the car for a minute, or so, then place it in the charger, it will

Hey guys,
 I've read that adding EDTA to a lead acid battery can help keep the
plates desulfated,and can help them last longer.Is there any truth to
it? Is this a common "trick"? Has anyone tried it,or have any other input?

What's the teams view of the effectiveness of pulsers such as:
http://www.courtiestown.co.uk/pulsers.htm
Snake oil or genuine benefit?
AWEM

Can anyone tell me can I connect two 7.2 V Ni-MH packs in series to get
14.4V, use it for powering 20 W halogen lamp, and after power runs down
disassemble it and charge 7.2 V packs separately, first one and then
another.

Where do you go to buy your lead acid batteries?
TMT

Respected sir,
Recently I had joined the group. Let me first of all introduce myself
to you. I am Hyam R.S. working in the field of MgB2 superconducting
films. Inorder to synthesize MgB2 we are making use of electrophoretic

Hi, all,
I am interested to find an answer for the following question: what are
the conditions of dehydration of lithium perchlorate? I have hydrous
LiClO4 but I need to measure I(V) properties of the cathode for the

Hi, all,
Did the urine battery kill this newsgroup? Or was it the FAQ that never
asked or answered a question? Or has the moderator taken a vacation? If this
gets posted, then maybe the moderator isn't in too bad shape. Come on, guys,

I have been collecting data of two copper electrodes (current over time
I-t plots) in water.  All of my results are explainable above 1.25v.
However, if you fix the electrodes at 1.25v and measure the current
over time the first 60 second, there is a decay, then it pans out for

   Would it be possible to calculate the values of resistance and
capacitance for a parallel RC equivalent circuit by measuring its
impedance just at a single frequency.  The calculation of R and C from
the complete multifrequency impedance spectrum is straightforward.

I have a crazy idea:
1. On my self suppored bicycle trips around the world I want to use a
digital camera.
2. I have faced reality and accepted that most digital cameras use

I have the Li-Ion Battery Charger.
This Charger is charge up the 21.6V BATT(3.6V X 6).
But I do not know it is function well or not.
How should i test it without using the real battery?

I have been working with NO and O2 electrodes [WPI] to measure
concentration of each gas in aqueous systems. But now I want to monitor
the gases in the lipid phase, and I'm afraid my electrodes won't work
that well in lipids, and that calibration will be tricky.

FYI...
http://www.livescience.com/humanbiology/050816_urine_battery.html
Power of Pee Runs a Battery
By Bjorn Carey