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Home › Batteries › SR616SW
Watch battery

SR616SW battery

1What it is2Safety3Other names4Facts5Buy it
  1. 1

    What it is

    SR616SW+ 1.55V

    SR616SW is a watch battery, about as wide as a pencil eraser. It gives 1.55 volts.

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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.

    321
  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
    Slim analog watches
  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 321
    See results on Amazon →
    Amazon searchMulti-packs from any brandSearch Amazon for SR616SW multi-packs
    See results on Amazon →
    Amazon searchDuracell listings, the same batterySearch Amazon for Duracell SR616SW
    See results on Amazon →

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

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See it at real size

SR616SW next to a US quarter and an AA battery. “Real size” matches your hand once your screen is set up in Measure it.

SR616SWThickness 1.6US quarterAA

What do the letters mean?

Battery names are a code. Here’s how to read SR616SW:

SSilver oxide chemistry (1.55V)
RRound coin / button form factor
6≈ 6 mm diameter (exact 6.8 mm, 0.268 in)
161.6 mm thickness (exact 1.6 mm, 0.063 in)
SWLow-drain variant for analog watches

The same battery from each brand

BrandTheir name for it
Official nameSR616SW
Energizer321
Murata (formerly Sony)SR616SW
Renata (Swiss)321
MaxellSR616SW

Exact measurements

Width
6.8 mm (0.268 in)
Thickness
1.6 mm
Voltage
1.55V (empty at 1.2V)
Energy stored
14.5 mAh
Weight
—
Made with
Silver oxide
Works between
-10 … 60 °C
Official code
SR616SW

Questions people ask

Is SR616SW the same as 321?

Yes. They’re the same battery with different names. You might also see 321.

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.

SR616SW+ 1.55V
SR616SWWatch battery
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1What it is2Safety3Other names4Facts5Buy it