to issue 18.
has been many many months since our last issue and I hope the
published in the past have proved useful to you. Based upon the
questions or comments since our last release, your existing
obviously working well
us should ever be complacent where batteries are concerned and in
be discussing a problem which many of you will hopefully never
Enjoy the article and hope
you will continue to subscribe to our
Editor: Alan Fidler.
Alan is the owner and manager of
CBC Design, a leading battery management company
based in the UK. He has worked in the industry for
over Eighteen years and
charging equipment and battery monitors for some of the world
ARTICLE: Battery Problems. Author:
last 12 months or so, we have read reports of people who have
catastrophic failure of their laptop caused by exploding
batteries. This raises concerns
the safety of the latest cell packs and it would be sensible to
happens so we can try to avoid problems
the reports I have read focus on one type of battery, specifically
are rapidly replacing the older NiCad and NiMh cells which were so
were good reasons behind the changes in laptop power batteries, more
weight and no memory effect were all positive reasons to switch to
Unfortunately, many contain Cobalt Oxide which can in certain
condition known as thermal runaway. This condition can be described
substance or device which gets hot which results in
increased conduction or burning
results in more heat and so on and so forth until failure
Explosive conditions are quite rare thankfully but they do
happen and when they go,
results is lots of smoke and possibly fire too. So why does it
happen and what can
we do to
it is imperative to avoid short circuiting the battery. This will
result in a large
uncontrolled current flow through the battery which will
generate a lot of heat. Never
out the battery terminals either directly or
Secondly, do not over charge the cells.
Again, heat will be the result and you could
battery into thermal runaway quite easily.
and this may sound obvious, do not expose the laptop and
battery to direct or
indirect sunlight or heat from any
artificial source. Keeping the battery cool at all
key to avoiding problems.
we are on the subject of heat, please remember that vehicles can get
particularly when left in full sunshine for most of the day.
You really cannot afford to
your laptop anywhere in your car, including the
replace the battery at the end of its serviceable life.
follow these simple guidelines, you should be able to avoid any
lithium ion cells. They are certainly very good batteries and as
long as they are
with respect, will give many years of reliable
Remember: Look after your batteries and
your batteries will look after you!
AUTOMATIC NICAD CONDITIONER
latest NiCad charger automatically conditions NiCad batteries by
cells to a specified potential before
applying a 3 stage charging cycle to
cells safely and completely.
Automatic discharge as required before
charging cycle commences!
charging, Constant Current (Boost) Float Charge and Trickle
indications for Battery Connected, Discharging, Charging and Battery
Available with 110/120 or 220/230 Mains
Designed for fixed recharge
for Switch Tripping applications!
Can be used to recharge Lithium Ion
Go to http://www.cbcdesign.co.uk/
and click the "New Products!"
link for more information.
12 & 24V DC
DIMMER SWITCHES in 60W, 150W & 300W
*Adjust 12 or 24V lamps from a dim
glow to bright light with a CBC Dimmer
*Extends bulb life and reduces battery
*Works just like the dimmers in your
*Easy to install with integral
*20 year industrial design
Questions from in-house
What is the optimum charging voltage for Nicad or NiMH
1.41 Volts Per Cell.
2. What is the preferred charging regime for
the same cells?
Constant current terminated by time,
voltage drop sensing or voltage
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