Natural Science Forum / Chemistry / Electrochemistry / July 2004

I posted a thread in this newsgroup, Subject: Two questions about li-ion
batteries, on 06/06/2004. The first question was if I should store my
li-ion batteries at 40% charge state, refrigerated. The answer was
"yes." The second question was:

Can anyone help.  I need to try and find a Circuit diagram and Calibration
Procedure for the EG&G Princeton 263A Potentiostat/Galvanostat.
If someone would be so kind and either scan or photocopy if they have the
manual I would be willing to pay for any oncosts.

Keep in mind this is just preliminary thoughts, before you start
nit-picking.
1. In order to charge strings of nickel based batteries in parallel we
have to use a regime that is primarily constant voltage, since we

http://www.sandia.gov/news-center/news-releases/2003/renew-energy-batt/betterlit
hium.html
Forgot if I hit "send" on this one already.  If I did then please
disregard.
What do you all think?  Is this the $50/kwh battery we've been waiting

What really happens in terms of electron flow and energy, when a
non-rechargeable battery is recharged? What causes them to explode when
recharged too fast or for too long?

Hi
When does migration stop and diffusion takes over? I have a material that whilst it seems to be a solid can still yield dendrites over time (I guess this is ion migration).  If this is the case from the literature I am reading ions only migrate in a liquid.  So am I seeing ...

Hi
I use a fluoride electrode with a separate standard Ag|AgCl reference
electrode.
I want to be able to correct the mV reading for temperature variations

Bosch NiCD battery cordless drill fast charger model 2 607 224 180. Resistor
R10 connects to switching (chopper) transistor. Remains of this 1/8W resistor
not legible re. color code.
Transistor (IRFP340) is not shorted.

A major name-brand cordless tool manufacturer's rep. told me over the phone
that the reason they weren't using NiMH batteries was that NiMH batteries
give 2-4 years of life, while NiCd gives 3-5 years.
Is there any truth to this statement?

My understanding is that lithium batteries should be kept fully
charged as much as possible with frequent top-ups, while ni-cad
batteries should be run down completely before recharging.  No topping
up.

Had them in my hand today, almost bought them, but decided to check on the
internet first!
I use Ansmann 2200 mAh batteries now, very very good:
they perform as they claim!

You have 3 9-volt NiCad batteries of known and uniform capacity you want to
fully discharge, but you have no wires or other equipment, so the only way you
can discharge them is by snapping two of them together, forming a short circuit
of 18 volts. But you don't want to reverse ...