OLYMPUS 303, 303H, GP357, SR44W, GP303 Service Manual

File:	357BatteryData.pdf
Ver:	1.00
Author:	Tim Hughes
Email:	[e-mail]

This document contains Anotated Technical Data on the “357” EverReady (Energizer) , Silver Oxide Batteries , which are high current capable cells, in an IEC size SR44 case.

Data Sheets from different production times, as well as other vendors data sheets are included. Data on replacements for the 357 cell (which ceased production few years ago) from EverReady are also included.

In addition for comparison, various other model AgO cells in the SR44 case size, are included.

Battery impedance data for the original 357 , is derived and plotted. This is based on the most detailed discharge curves supplied in the original 357 data sheets.

T.Hughes

From mathcad File: 357Capacity.mcd ver 1.0

(c) T.Hughes 2006/2007

This file discusses Silver Oxide type 357 battery characteristics. (SR44 size)

It calculates and plots "typical" battery impedance data from discharge curves originally published for the high current 357 EverReady (Potassium Hydroxide Electrolyte) silver oxide battery, in the Union Carbide (EverReady brand) Battery databook. This data book which has been out of print for many years, contained the most comprehensive data for the 357 ever published.

The 357 specs changed over the years and Everready no longer makes the 357.

The current EverReady replacements,for the 357 are known as the "357/303" and also "357/303H" (higher current), these have characteristics between that of the of the original low current (NaOH) 303, and the 357.

Even the "H" version appears a bit less capable for high current applications. The original 357 was specified at a wrist temperature (LED wrist watch usage) of 35 degC, unlike most cells today, which are rated at ~21 deg C.

Keep in mind that running at 35 deg C gives slightly improved performance, as the cell impedance is a bit less at 35C, than it would be at room temperature. Later versions of the battery and revisions of the data sheet for the 357, were specified at room temperature (21C).

EverReady originally made a number of cells in the same SR44 case size as the 357, including the 303, but the 357 had the flattest discharge curve with the highest current capability, making it most suitable for Olympus OM SLR cameras and similar devices.

Rated Capacity:

From original 357 Data Sheet :

Energizer 357 with 6500Ohms constant load @35C

at 1.54V	725hrs
at 1.50V 780hrs		or	~185 mAh
at 1.45V 800hrs
at 1.3V	810hrs	or	~ 192 mAh
at 0.8V	820hrs
Original 357 spec was tested at 35C ("wrist temperature")
				1.54 V		= 0.237 mA
				6500 ohm
Approx mAhr:				1.54 V 780 hr
							= 184.8 mA hr
				6500 ohm
				1.54 V 810 hr			= 191.908 mA hr
				6500 ohm

Here we setup and enter the discharge curve data from the original 357 data sheet:

	Set index for data array:					i :=		0 ..19
			0	1.565	1.55	1.41
			2	1.55	1.54	1.4
			5	1.55	1.53	1.38
			10	1.55	1.525	1.365
		15		1.55	1.52	1.37
			20	1.55	1.518	1.39
			25	1.55	1.517	1.394
		30		1.55	1.516	1.393
			35	1.55	1.515	1.392
			40	1.55	1.514	1.39
	Dat :=							Extract data into named arrays for plotting:
			60	1.55	1.508	1.37
										in mAh
								Capacity := Dat	i,0
		80		1.55	1.5	1.35		i
		100		1.55	1.495	1.326		Voltages @ loads of 30 Ohms, 100 Ohms and 92kOhms
			120	1.55	1.49	1.311
			145	1.55	1.484	1.3
								Voltage with continuous 92k Ohm (16uA) load:
		150		1.55	1.48	1.295
			160	1.55	1.468	1.277				V92ki := Dati,1
			170	1.55	1.445	1.23		100 ohm pulsed load on top of 16uA load:
			175	1.55	1.43	1.19				V100i := Dati,2
		180		1.55	1.41	1.15		30 ohm pulsed load on top of 16uA:

V30i := Dati,3

Plot Battery voltages at end of various pulse loads during a 16uA slow discharge (92k Ohm Continuous load,100 Ohm, 30 Ohm pulse loads, based on the original 357 published data sheet:

Volts

	1.6
	1.5
V92ki	1.4
V100i	1.3
V30i
	1.2
	1.1
	1	0	20	40	60	80	100	120	140	160	180
						Capacityi
						Delivered mAhr

Combine slow 16uA continuous background discharge (92k Ohm load) data , with pulse data.

We Calculate Battery "DC" Impedance at pulse loads of

30 ohms

(tested for 2sec,

24 times per day) , (~47mA pulse)

100 ohms

(tested for 2sec,

12 times per day)

(~15mA pulse ,

(15mA is similar to to load from OM camera shutter):

R100 :=

(V92ki − V100i)

R30

:=

(V92ki − V30i)

V100

i

V30

i

i

i

100

30

"DC" Battery 2sec Pulse Impedance at 30 ohm load (Blue curve) and 100 ohm load (Red) with 16uA background current, tested at at 35C (calc based on original data sheet voltages):

ohms

12
10
8
R100i
6
R30i
4
2
0	0	20	40	60	80	100	120	140	160	180
					Capacityi
					Delivered mAhr

Internal Resistance: From Guaranteed Spec (from original data sheet) : >1.2V at 100 Ohm, 0.1sec to 2sec pulse, this translates to ~ 29 Ohm :

	(1.55V − 1.2V)			= 29.167 Ω	note the last ( 2004), 357 battery data sheet,
	1.2V
					guaranteed a lower max value of ~19 Ohm

100ohm

Note this spec is considerably higher than the graph, even at end of discharge.

After sitting on the shelf for ~2yrs at 20C , depending on the vendor the battery impedance may rise into the ~20 Ohms region at partial discharge, which may explain this higher max "guaranteed" impedance spec than the typical values shown in these curves.

Last (3/29/2004) data sheet available for Energizer 357 has this guaranteed worst case spec: 100 Ohm 2 Sec load >1.3V at 21C This translates to ~19 Ohms

It also has:
0% discharge typ spec @100 Ohms, 5sec :1.55V (~50/15	very approx 3 Ohm) cf ~2 Ohm above
40% discharge typ spec @100 Ohms,5sec :1.40V (~150/14	= 10.8 Ohm)	cf ~3 Ohm	"
80% discharge typ spec @100 Ohms,5sec :1.34V (~210/13.4 = 15.67 Ohm)		cf ~4.2 Ohm	"

(8/25/2006) Energizer 303/357H spec for impedance :

2 - 8 Ohm at 40Hz @ 21C

(note 40Hz spec is not as tough a test as 2sec pulse test of original 357 data book)

Sony SR44W (KOH) has a rating of 180mAh @ 4.7K load, 540hrs @ 23C,

525hrs @ 50C, 470hrs @ -10C

(note : SR44SW is NaOH cell)

Other vendors part numbers for SR44 size cells (beware of LR44 Alkaline "replacements, which are not suitable replacements in most applications):

7228, 1131SO, 10L14, J, D357H, G13, RW42, S76E, SR44W, V357 10L14, 228, 280-62, 357, D357, D357H, EPX76, G13, GP57, GPS76E, HS-C, J, KS76, LR44H, M02, MR44, MS76, NP-313, NP313, S05, S1154, S76, S76E, SB-B9, SG13, SP357, SR1154, SR44, SR44W, V313, V357, V76PX

Other names listed on web :

Renata 303 UCAR 303 Maxell SR44SW Panasonic SR44SW Sony SR44SW Toshiba SR44SW Varta V303 Rayovac 303 Timex A Citizen 280-08 Seiko SB-A9 I.E.C. SR44 I.E.C. SR1154

1.5

"EVEREADY NO. 357 CELL

From Everready (Exide)

Type: Silver Oxide

Designations: ANSI-WSl5, IEC-SR44

THIS BATTERY IS DESIGNED FOR USE ON CONTINUOUS LOW DRAIN-

HIGH PULSE DRAIN ON DEMAND.

	PhRM/.SS/BLE DEFL EC-
	7/0N FROM A F L A T:
SPEC1FlCATlONS		- ,+1. 5
Voltage Taps .................................................................................
Average Service Capacity (to 1.3 volts) ..................		1 9 0 milliampere-hours
(Rated capacity at 6,500 ohm load at 35'C)
Terminals.. .................. .. ............................................... Fat Contacts
Average Weight ...................... ..	. . . . . . . . . . . . . . . . . . . .	0 0 8 0 oz. (2.27 grams)
Volume.................................	0.029 cubic inch (0.48 cubic centimeter)
Cell.............................................................................		One No. 6-45202

For service information see reverse side of this sheet

T H . 2 0 0 7

"EVEREADY NO. 357

Estimated Service at 9 5 O (~3 5 O ~ )

	STARTING
	D R A I N	L O A D	CUTOFF VOLTAGE
SCHEDULE	~ r n i c r o a m ~ e r r s l	(ohmsl	-
			0.9V
24 hourstday	242	6.500	820 hours 810 hours

HOURS OF SERVICE

A v e r a g e P e r f o r m a n c e D a t a a t 95OF (35OC)

Background: 94,000ohms continuous (IC simulated load 16.8 microamperes) Pulse W ~ d t h2 seconds

Pulse Frequency 30 ohms @ 24/day (LED s~mulat~on)

"EVEREADY NO. 357

AVERAGE CAPACITY VS. LOAD

LOAD (ohms)

Estimated Service Capacity vs. Pulsed Load [at 9S°F (3S°C)]

		PULSES	SERVICE CAPACITY
PULSE		PER		TO
LOAD	PULSE	DAY	0 . 9 ~1 . 2 ~
-	-	-
150 ohms	2 seconds/ hour	24		190 mAh
100	2 seconds/ hour	12		185
50	2 seconds/hour	24		180
30	2 seconds/ hour	24	185 mAh 175
20	2 seconds/hour	24	175	125
10	2 seconds/hour	24	120	15
150	2 seconds/lO mlnutes	144
100	2 seconds/lO minutes	144
50	2 seconds/lO mlnutes	144
30	2 seconds/lO minutes	144
20	2 seconds/lO minutes	144
10	2 seconds/lO minutes	144

INTERNAL RESISTANCE

Closed circuit voltage no less than .................................	1.2 volts
On a'loadof ......................................................	I 0 0 ohms
for 0.1 to 2 seconds