On Fri, 27 Aug 2010 01:41:54 +0100, Grimly Curmudgeon
hardly find AAA batteries for devices they took with them. Might be
different today. AAA batteries were virtually unobtanium in Zambia,
and not much better in Burkina Faso. AA was common - D was everywhere.
In Britland they had there own "torch" batteries that we never, or
seldom, see for sale in Canada or the US.
Cobblers. Or rather, your friends couldn't have tried too hard. I've
been able to buy AAA batteries across Europe (Germany, Belgium, France,
Luxembourg, Switzerland, Italy, Spain, Portugal) for at least the last
30 years. In supermarkets, garages, tobacconists and hardware shops. And
of course your new claim that "friends" could "hardly find" AAA
batteries 10 to 15 years ago is hardly relevant to today or to your
stupid claim that "AAA batteries are almost unheard of in Europe and
Try not talking shit and people might just stop laughing at you. Until
then, put down the shovel and step away from the hole.
to load Ubuntu on them, and put them on the swap board at work for 30
bucks or so, as 'emergency backup e-mail terminals, for when you can't
get the kids off the real computer.' Perfectly adequate for that, or for
use as typewriters for simple word processing. Haven't checked lately to
see if they remember the date, but I have fired up computers stored for
3-4 years before, and they came right up and said hello.
Fuck it. I get P4 class machines for nothing from people who can't
run windows on them any more. Have a pentium-m laptop as a firewall
and a P4 Dell as an asterisk based home PBX. Total cost for both
This RISC OS RPC is 1996, and still on the original battery. It's only
powered up when in use - so no more than a couple of hours a day on
average. And survived my last holiday.
But I really should change the battery as a precaution.
*Never kick a cow pat on a hot day *
Dave Plowman firstname.lastname@example.org London SW
OP didn't mention that. I did. And only in relation to
permanently-affixed CMOS batteries, which were only brought up as an
example. I had mistakenly believed that the leads on such batteries were
soldered to the battery, but have since been corrected.
There are warnings about charging lithiums and having them explode. I
have never heard of it happening and have seen applications where they
were being charged and nothing happened. (they must be very toxic-you
need a label when shipping them)
Li polymer batteries are worse, but you can find exploding button
cells on Youtube if you look: http://www.youtube.com/watch?v=te3oRB9rv8E
In the comments, someone said they had one explode whilst soldering it.
[email address is not usable -- followup in the newsgroup]
I've soldered to batteries many times.
Heat a spot on the battery, leaeve a blob of solder.
Tin the wire with solder.
Reheat blob on battery, stick wire in blob, remove iron, hold very
still while it cools.
On Tue, 24 Aug 2010 10:53:14 +0100, john hamilton wrote:
Yes, they can go bang when soldering if you apply too much heat for too
long. Applying power to one probably isn't a good idea, either (you'd
basically be trying to recharge an no-rechargeable cell - I doubt it'd
outright explode or catch fire, but it might leak, and ever the vapours
from batteries can make a real mess of PCB traces).
Personally I'd desolder it - preferably cutting it from the PCB first and
then desoldering the legs that remain. What the device is would dictate
whether I'd fit a direct replacement, or a socket, or trailing wires to a
socket, or trailing wires to a holder to take AAAs etc.
make a dummy battery. A disk of double sided ecb material will work.
solder to the copper, shim for thickness.
Don't have a disk?
use a nickel and a dime with insulation between.
Depending on the socket, you may have to build up the
diameter a little with solder.
Thanks to all. Mike's suggestion of just finding disc/washer the same size
at the battery is a good simple solution. why didn't i think of that?
Removes the need to be worrying about leaking or explosions.
The reason to replace the button battery with a couple of AAA batteries in a
holder, is that the battery powers a very small Laser beam. It really eats
the batteries. My understanding is that if I use two rechargable batteries
and they are in series I'm going to get about 2.4 V total instead of the 3.4
V of the button battery. Am I right in thinking that this lower voltage
will not do any damage to the Laser light mechanism? If it is a bit dimmer
as a result, I dont mind.
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