30 Aug
2006
30 Aug
'06
7:43 a.m.
From: "Josef Chessor" <josefcub at
gmail.com>
On 8/29/06, Tony Duell <ard at
p850ug1.demon.co.uk> wrote:
Hi
The only problem with these cells is that they have only about a month
life once activated. In Canon's one can also add a germanium diode
in series with the battery. This does require that there be some load
or there isn't enough current to provide the drop.
Of course, I'd suspect that any reasonable stack of cells that produces
a voltage less than the rail voltage will work. This is mostly for CMOS
operation and they have a wide range of operation.
Dwight
There's some problem that the original cells in the computer were 1.35V
mercury cells. The replacements (alkaline cells) are closer to 1.5V. I
know some (all?) PC1211s do odd things if given 4 alkaline cells. A
silicon diode in series with one of the battery conenctions generally
fixes that.
There's a solution to the mercury battery issue. My 35 year-old Canon
35mm SLR camera requires PX625 mercury cells. Today, since they're
illegal in the US from what I understand, there exists what's called
the 'Wein cell'. 1.35V zinc-air battery.
Of course I don't know exactly what the PC-1211 requires, but it's a
thought.
http://www.weincell.com/
Josef
--
"I laugh because I dare not cry. This is a crazy world
and the only way to enjoy it is to treat it as a joke."
-- Hilda "Sharpie" Burroughs,
"The Number of the Beast" by Robert A. Heinlein