Camera Batteries for the Mamiya 6

Mamiya 6 and Mamiya 6 MF cameras use a silver oxide button cell, SR44 size, aka 357, 11.6mm diameter by 5.4mm high

Search for “SR44 batteries” and you’ll likely get a mix of somewhat confusing results.  SR44, LR44, 357/303, A76, etc.

 

TL;DR-Recommended batteries for Mamiya 6

Silver Oxide 357/303 from Energizer MFR: 357BPZ

Easiest Places to buy Energizer 357/303

Retailer Pack of 1 Pack of 3
Adorama https://bit.ly/3wFw4x6 https://bit.ly/3wsnxh9
Best Buy https://bit.ly/3q8BS01 https://bit.ly/2TB8yTj
Target https://bit.ly/3grKPxZ

 

I’m looking for SR44 so what are all the other numbers?

 

The numbers identify the battery size.

Four-digit code: 1154 – obviously, 11.6 mm diameter, 5.4 mm height,

Two-digit code: 44 – code that identifies 11.6 mm diameter, 5.4 mm height battery.

So, SR44 or SR1154 battery is the battery with 11.6 mm diameter and 5.4 mm height.

The SR44W is the high-drain version, and is sometimes referred to as a 357 cell. This type is the one you’d generally want to use.

The SR44SW is the low-drain version, and is sometimes referred to as a 303 cell. This is used more for memory-backup applications or small clocks.

What is the difference between SR44 and LR44?

  • SR44 is a Silver Oxide battery and LR44 is an Alkaline battery
  • Identical physical size(11.6mm diameter by 5.4mm high)
  • Similar voltage (1.55v for SR44-v- 1.5v fr LR44)
  • SR44 drains slower over time.  LR44 will drop off in power sooner
  • SR44 batteries are slightly more expensive than LR44

LR44 and SR44 are the same physical size. However, the terminal voltage of the SR version is a tad higher (1.55v -v- 1.5v) and its capacity is also higher.

There are many devices around that are designed to work with the LR44 battery.

The SR44 can replace the LR44 and visa versa. The SR version is silver oxide which is slightly more expensive, has higher power density, and is better for use in low drain, long battery life applications, such as digital calipers, watches and the like.

Performance

Alkaline batteries have a relatively sloping discharge curve, meaning that as they wear down with use, the voltage will decrease. The silver oxide batteries, however, have a flat curve, meaning they will maintain their voltage right up until they die. This makes them a preferred choice for some watches that would not run accurately at lower voltage. Both will operate in a typical temperature range of from –4 degrees F to 130 degrees F.

Mamiya 6 and Mamiya 6 MF cameras use a silver oxide button cell, SR44 size, aka 357, 11.6mm diameter by 5.4mm high.

A genuine SR44 or 357 cell silver oxide is hard to find

The LR44 batteries are the same size button, and same nominal voltage’  s very common and easy to find.

Alkaline LR44 cell are used in toys, laser pointers, etc., and therefor cheaper and easier to find.

However, alkaline buttons have much less mAh capacity, and will quit working when battery voltage falls. Alkaline cells quickly “droop” their voltage (they have a non-flat discharge curve), compared to silver oxide.

Specs Compared

The table below is based on the product data sheets from Energizer.  Other manufacturers publish their own specs but these were the most accessible specs for a comparison of SR44 to LR44.

SR44

“Silver Oxide

(ENERGIZER 357/303)

LR44

“Alkaline”

(ENERGIZER A76 )

Chemical System: Silver Oxide (Zn/Ag2O) Manganese Dioxide (MnO2 )
Nominal Voltage 1.55 Volts 1.5 Volts
Typical Capacity: 138 mAh* (to 1.2 volts) 175 mAh* (to 0.9 volts)
Capacity Test: 6.8K ohm continuous drain at 21°C 6.8K ohm continuous drain at 21°C (70°F)
Typical Weight: 2.3 grams (0.08 oz.) 1.85 grams (0.07 oz.)
Typical Volume: 0.57 cubic centimeters (0.035 cubic inch) 0.57 cubic centimeters (0.035 cubic inch)
Impedance (40 Hz): 2 to 8 ohms 5 to 15 ohms
Max Bulge: NA This battery will bulge as it is discharged, but will not exceed the maximum height shown on the battery drawing.
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The SR44W is the high-drain version, and is sometimes referred to as a 357 cell. This type is the one you’d generally want to use.

The SR44SW is the low-drain version, and is sometimes referred to as a 303 cell. This is used more for memory-backup applications or small clocks.

National Electronic Distributors Association (NEDA) often cited by American manufacturers

American National Standards Institute (ANSI)

The International Electrotechnical Commission (IEC)

https://data.energizer.com/PDFs/EPX76Z.pdf

ENERGIZER 357/303: http://data.energizer.com/PDFs/357-303Z.pdf

ENERGIZER 357/303H: http://data.energizer.com/PDFs/357-303hz.pdf
ENERGIZER EPX76: http://data.energizer.com/PDFs/EPX76Z.pdf

 

https://www.duracell.com/wp-content/uploads/2016/03/D303-D3571.pdf

 

 

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