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Home › Can I swap? › SR1116SW vs MR42
Can I swap?

SR1116SW vs MR42: can you swap them?

1The short answer2Both ways3Differences4Buy it5Learn more
  1. 1

    The short answer

    NoNo, don’t swap theseThey give different amounts of power (1.55 volts vs 1.4 volts). The wrong one can damage your device or simply won’t work.
    SR1116SW+ 1.55V
    SR1116SWAs thick as 2 credit cards stacked
    MR42+ 1.4V
    MR42As thick as 5 credit cards stacked
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  2. 2

    Both ways round

    Can I put MR42 where SR1116SW goes?No
    Can I put SR1116SW where MR42 goes?No
  3. 3

    What’s different

    SR1116SWMR42
    SizeAbout as wide as a shirt buttonAbout as wide as a shirt button Same
    ThicknessAs thick as 2 credit cards stackedAs thick as 5 credit cards stacked
    Power1.55 volts1.4 volts
    KindWatch batteryButton battery

    Lasts longer: MR42 (about 135% longer)

  4. 4

    Where to buy SR1116SW

    As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

    Amazon searchEnergizer listings, any pack sizeSearch Amazon for Energizer 366
    See results on Amazon →
    Amazon searchMulti-packs from any brandSearch Amazon for SR1116SW multi-packs
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    Amazon searchDuracell D366 listings, the same batterySearch Amazon for Duracell D366
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    Search Amazon for MR42As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.
  5. 5

    Learn more

    About SR1116SWAbout MR42Check another pair
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Questions people ask

Can I use MR42 instead of SR1116SW?

No. They give different amounts of power (1.55 volts vs 1.4 volts). The wrong one can damage your device or simply won’t work.

Can I use SR1116SW instead of MR42?

No. They give different amounts of power (1.55 volts vs 1.4 volts). The wrong one can damage your device or simply won’t work.

Which one lasts longer?

MR42 (about 135% longer).

All the numbers

SR1116SWMR42
Diameter11.6 mm11.6 mm
Height1.7 mm3.6 mm
Nominal voltage1.55V1.4V
Typical capacity34 mAh80 mAh
ChemistrySilver oxideMercury oxide
Shelf life5 yrs5 yrs
Operating temp-10 to 60 °C-10 to 60 °C
Can I use MR42 instead of SR1116SW?No
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1The short answer2Both ways3Differences4Buy it5Learn more