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Home › Batteries › 303
Watch battery

303 is the same as SR44

1What it is2Safety3Other names4Tip5Facts6Buy it7Things8Swaps
  1. 1

    What it is

    SR44+ 1.55V

    303 is just another name for SR44. Same battery, different label, so you can buy either one.

    Get SR44 on AmazonAs an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

    Something wrong or missing? Tell us

  2. 2

    Safety first

    Keep away from children and pets

    A swallowed coin or button battery can cause serious burns inside the body within 2 hours. If you think one was swallowed, get emergency help right away.

    Swallowed one? What to do now →
  3. 3

    Names you might see in the store

    All of these are the same battery. Any of them will work.

    SR44357SR1154D357V3571131SO
  4. 4

    Good to know

    This is the better version of LR44

    LR44 fits too and is cheaper, but runs down sooner.

  5. 5

    Quick facts

    Size
    About as wide as a shirt button
    Thickness
    As thick as 7 credit cards stacked
    Power
    1.55 volts
    Keeps in a drawer for
    About 5 years
    Rechargeable?
    No, use once
    Found in things like
    Vintage film camerasPrecision calipersWatchesMedical devices
  6. 6

    Where to buy it

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

    Our pickThe exact match, 4-packEnergizer 303 (SR44) 1.55V Battery (4-Pack)
    Check Price on Amazon →
    Best value10-pack, handy to keep in a drawer303 (SR44) 1.55V Battery Value Pack (10-Pack)
    Check Price on Amazon →
    Other brandDuracell D357, the same batteryDuracell D357 / SR44 1.55V Battery
    Check Price on Amazon →

    Buttons open amazon.com 🇺🇸, picked from your country.

  7. 7

    Things that use SR44

    Mitutoyo Digimatic Caliper (500 series)Takes SR44›
  8. 8

    Can I use something else?

    Can I use SR44 instead of LR44?YesCan I use 303 instead of 357?Yes
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See it at real size

SR44 next to a US quarter and an AA battery. “Real size” matches your hand once your screen is set up in Measure it.

SR44Thickness 5.4US quarterAA

What do the letters mean?

Battery names are a code. Here’s how to read 303:

3Watch-industry 300 series (Renata/Energizer numbering)
03Size and drain code. Maps to SR44, 11.6 × 5.4 mm

The same battery from each brand

BrandTheir name for it
Official nameSR44
Energizer357
DuracellD357
Murata (formerly Sony)357
Renata (Swiss)357
PanasonicSR44
VartaV357
MaxellSR44

Exact measurements

Width
11.6 mm (0.457 in)
Thickness
5.4 mm
Voltage
1.55V (empty at 1.2V)
Energy stored
160 mAh
Weight
2.3 g
Made with
Silver oxide
Works between
-10 … 60 °C
Official code
SR44 · ANSI 1131SO

Questions people ask

Is 303 the same as SR44?

Yes. They’re the same battery with different names. You might also see SR44, 357, SR1154, D357.

Can I use LR44 instead?

Yes, in a pinch. Same size, but it runs down a bit sooner.

How long will a spare keep in a drawer?

About 5 years if it stays cool and dry.

Can I recharge it?

No. Never try to recharge it.

Which way up does it go?

Usually with the side marked “+” facing you or facing up. Look at how the old one sits before you take it out.

SR44+ 1.55V
SR44Watch battery
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1What it is2Safety3Other names4Tip5Facts6Buy it7Things8Swaps