Watches · 1989–2026

Casio F-91W battery

The battery you need
It takes one CR2016: a coin battery, about the size of a nickel.
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2
How to change it
You’ll need: #00 jeweler’s screwdriver, tweezers
1. Open the caseback
  Remove the four caseback screws and lift the back and rubber gasket.
2. Release the clip
  Slide the metal retaining clip aside and lift out the old cell.
3. Insert and reset
  Fit the CR2016 with + up, then touch the AC contact and the cell’s + face with tweezers for a second to reset the module.
Handy tip
Reseat the rubber gasket flat before closing or the watch loses its splash resistance.
Where to buy it
As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.
Our pickThe exact match, 4-packEnergizer CR2016 3.0V Battery (4-Pack)
Check Price on Amazon →
Best value10-pack, handy to keep in a drawerCR2016 3.0V Battery Value Pack (10-Pack)
Check Price on Amazon →
Other brandDuracell DL2016, the same batteryDuracell DL2016 / CR2016 3.0V Battery
Check Price on Amazon →
Buttons open amazon.com 🇺🇸, picked from your country.
Remind me to change it
A new battery usually lasts about 2 years in this device.
That’s around October 2028.
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Also sold as
Any of these names is the same battery.
CR2016 DL2016 ECR2016 5000LC 6016
Other things that use CR2016
Casio G-Shock DW-5600ETakes CR2016

Show more details (optional)

Questions people ask

What battery does the Casio F-91W take?

It takes CR2016, a coin battery.

Can I use DL2016 instead?

Yes. DL2016, ECR2016, 5000LC are the same battery with other names.

How long will the new battery last?

Usually about 2 years, depending on how much you use it. Most devices warn you when it gets low.

About the CR2016

Size: About the size of a nickel
Thickness: As thick as 2 credit cards stacked
Power: 3 volts
Keeps in a drawer for: About 10 years
Rechargeable?: No, use once

Found in things like

Casio digital watchesSlim key fobsSmall remotes

Everything about CR2016

How to change it

You’ll need: #00 jeweler’s screwdriver, tweezers

Open the caseback

Remove the four caseback screws and lift the back and rubber gasket.

Release the clip

Slide the metal retaining clip aside and lift out the old cell.

Insert and reset

Fit the CR2016 with + up, then touch the AC contact and the cell’s + face with tweezers for a second to reset the module.

Handy tip

Reseat the rubber gasket flat before closing or the watch loses its splash resistance.

Where to buy it

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

Our pickThe exact match, 4-packEnergizer CR2016 3.0V Battery (4-Pack)

Check Price on Amazon →

Best value10-pack, handy to keep in a drawerCR2016 3.0V Battery Value Pack (10-Pack)

Check Price on Amazon →

Other brandDuracell DL2016, the same batteryDuracell DL2016 / CR2016 3.0V Battery

Check Price on Amazon →

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

Questions people ask

What battery does the Casio F-91W take?

It takes CR2016, a coin battery.

Can I use DL2016 instead?

Yes. DL2016, ECR2016, 5000LC are the same battery with other names.

How long will the new battery last?

Usually about 2 years, depending on how much you use it. Most devices warn you when it gets low.

Casio F-91W battery

The battery you need

How to change it

Open the caseback

Release the clip

Insert and reset

Handy tip

Where to buy it

Remind me to change it

Also sold as

Other things that use CR2016

Questions people ask

About the CR2016

Casio F-91W battery

The battery you need

How to change it

Open the caseback

Release the clip

Insert and reset

Handy tip

Where to buy it

Remind me to change it

Also sold as

Other things that use CR2016

Questions people ask

About the CR2016