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Home › Batteries › SR512
Watch battery

SR512 is the same as SR512SW

1What it is2Safety3Other names4Facts5Buy it
  1. 1

    What it is

    SR512SW+ 1.55V

    SR512 is just another name for SR512SW. Same battery, different label, so you can buy either one.

    Search Amazon for SR512As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

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  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.

    SR512SW335V335
  4. 4

    Quick facts

    Size
    About as wide as a pencil eraser
    Thickness
    As thick as 2 credit cards stacked
    Power
    1.55 volts
    Keeps in a drawer for
    About 5 years
    Rechargeable?
    No, use once
    Found in things like
    Small ladies’ watchesPrecision instruments
  5. 5

    Where to buy it

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

    Amazon searchEnergizer listings, any pack sizeSearch Amazon for Energizer 335
    See results on Amazon →
    Amazon searchMulti-packs from any brandSearch Amazon for SR512 (SR512SW) multi-packs
    See results on Amazon →
    Amazon searchDuracell listings, the same batterySearch Amazon for Duracell SR512SW
    See results on Amazon →

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

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See it at real size

SR512SW next to a US quarter and an AA battery. “Real size” matches your hand once your screen is set up in Measure it.

SR512SWThickness 1.3US quarterAA

What do the letters mean?

Battery names are a code. Here’s how to read SR512:

SSilver oxide chemistry (1.55V)
RRound coin / button form factor
5≈ 5 mm diameter (exact 5.8 mm, 0.228 in)
121.2 mm thickness (exact 1.3 mm, 0.049 in)

The same battery from each brand

BrandTheir name for it
Official nameSR512SW
Energizer335
Renata (Swiss)335
VartaV335
MaxellSR512SW

Exact measurements

Width
5.8 mm (0.228 in)
Thickness
1.3 mm
Voltage
1.55V (empty at 1.2V)
Energy stored
5.5 mAh
Weight
—
Made with
Silver oxide
Works between
-10 … 60 °C
Official code
SR512SW

Questions people ask

Is SR512 the same as SR512SW?

Yes. They’re the same battery with different names. You might also see SR512SW, 335, V335.

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.

SR512SW+ 1.55V
SR512SWWatch battery
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1What it is2Safety3Other names4Facts5Buy it