At 12:57 PM 8/3/2002 -0500, John Lind you wrote in part:
IMPORTANT NOTES ABOUT SILVER CELLS THAT HAPPEN TO BE THE SAME SIZE:
There is a difference between the specifications for a #301 and a #386,
and between an EPX76 (aka MS76) and a #357:
mAh Volt ANSI # Wt(g) Dia(mm) Ht(mm)
------------------------------------------------
#301: 110 1.55 1132SO 1.7 11.6 4.2
#386: 120 1.55 1133SO 1.7 11.6 4.2
------------------------------------------------
#357: 175 1.55 1131SO 2.3 11.6 5.4
EPX76: 200 1.55 1107SOP 2.27 11.6 5.4
------------------------------------------------
The data sheets also show differences in application and in voltage
falloff over their lifespans.
#301:
Intended for continuous low drain. Data sheet test for voltage falloff is
at 0.103 mA. Voltage drops from 1.5 to 1.3 Volts during last 50f life.
#386:
Intended for continuous low drain with high pulse drain on demand. Data
sheet test for voltage falloff is at 0.238 mA. Voltage drops from 1.5 to
1.3 Volts during last 50f life.
EPX76:
Intended for photo use. Data sheet test for for voltage falloff is at
0.215 mA. Voltage falls from 1.5 V to about 0.9 V during last 600f life.
#357:
Intended for continuous low drain with high pulse drain on demand. Data
sheet test for voltage falloff is at 0.238 mA. Voltage drops from 1.5 to
1.3 Volts during last 100f life.
My conclusions:
(a) For the older MR-9's for which C.R.I.S. stated they used the larger
MS76 cells, it is *much* better to use #357 cells in them instead due to
the voltage falloff curves!
(b) For the newer MR-9's that C.R.I.S. states should use the #386 cells,
these are a better choice than using #301 cells. The #386 cells will last
a bit longer and tolerate higher drain.
John,
Thank you, as always. I got the SR43 off the actual package my latest MR-9
came in (it was the only thing I could read as the rest was in Japanese)
and #301 off an equivalence table somewhere. I guess I remember the #386
now that you mention it, but I had no basis for selecting one or the other
before you posted. Much appreciated.
Now -- do you know of a way of determining which MR-9 is which by physical
markings? The only difference I can see is that my older one (for SR44) is
very shiny, whereas the new one (for SR43) is brushed chrome. The diode in
each says "2A". It is the same for you?
Joel W.
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