The batteries that I bought are the 357s. On the package it says they replace
the
LR44/MS76 etc and that it is Silver Oxide, however it doesn't say that on the
battery(that its silver oxide)
I know alkaline batteries wear out faster so I currently have the silver oxide
MS76 on my OM 4, and they
are still running strong, partly because I am fanatical about setting the
shutter dial to B after every exposure.(!)
However my concern is the voltage difference. The package on the 357 says its a
1.55v battery while the
OM4 runs on a 3v source. So will a 3.1v power supply as opposed to a 3v, make
a difference in shutter speeds
and/or metering ?
Just to experiment, I spot metered an area under fixed illumination. The new
batteries (357) were showing
1/3 less exposure (higher shutter speed) than my current MS76 silver oxides.
But then that could be due to
the fact that my older batteries have been in use for over 2 months ( ~10
rolls), or , because of the higher
voltage of the new batteries. I am not sure.
----- Original Message -----
From: "John A. Lind" <jlind@xxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, November 22, 2002 10:53 PM
Subject: Re: [OM] are 1.55 volt batteries OK for the OM-4 ?
> No!
>
> The LR-44 is the *alkaline* version of the ~1.5 Volt SR-44 silver cell, and
> is the same as a MS76A. Clint is absolutely correct that it will not
> last long (even though it's alkaline, not lithium). However, in a "double
> digit" OM (e.g. OM-10) or in an OM-2[n,S], OM-3[ti] or OM-4[T] it will not
> throw the metering off. Both alkalines and lithiums gradually drop in
> voltage starting at about half life. The OM-4 and OM-4T are both finicky
> about sufficient battery voltage for operating the shutter. Alkalines and
> lithiums fall below the minimum well before actual end of cell life and the
> shutter locks up (to recover, replace the cells or switch shutter speed
> ring into one of the two mechanical speeds [red "60" or "B"]).
>
> Best cells for the OM-4[T] are 303 or 357 silver oxide watch cells, which
> translate to SR44W and SR44SW. They are slightly better than the silver
> oxide SR44P or MS76 photo cells (the MS76A is alkaline). The watch cells
> are designed to withstand the slight drain current of an OM-4[T] in
> "standby" mode better than the photo cells can.
>
> The lithium button cells C.H. Ling referred to are the Energizer 2L76BP,
> Duracell 7K67 and Rayovac 867. These are twice the height of a single
> 303/357/MS76/SR44/etc. (all of which have the same form factor).
>
> FYI:
> The two bodies with meter accuracy sensitive to battery voltage are the
> OM-1 and OM-1n. They were designed to use the 1.35 Volt PX-625 mercury
> cell. Do not use a 1.5 volt PX-625A alkaline cell in them.
>
> -- John
>
> At 00:55 11/23/02, C.H.Ling wrote:
> >I think lithium button cell is 3V.
> >
> >C.H.Ling
> >
> >----- Original Message -----
> >From: <clintonr@xxxxxxxxxxxxxxxx>
> >
> >
> > > I believe these are actually lithium batteries, though I may be wrong --
> > > check the package. It they aren't "silver oxide" batteries, they'll go
> > > dead rather quickly. Use nothing but silver oxides.
> > >
> > >
> > > Tim Chakravorty wrote:
> > > >
> > > > I picked up a couple of Energizer Silver Oxide (LR-44) 1.55 v batteries
> >from
> > > > a local walmart.
> > > > The question is will a +0.1v throw the metering off ? Will I need to
> >compensate
> > > > for exposure ? Is it recommended at all ?
> > > > As far as I know LR-44s are 1.5 v batteries, I dont know why these ones
> > > > are 1.55v
> > > > Thanks,
> > > > Tim
> > > >
>
>
> < This message was delivered via the Olympus Mailing List >
> < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
> < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
>
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|