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Watch battery · rechargeable

CTL621F battery

CTL621F. 6.81 × 2.1 mm1 rechargeable, 2.3 V1. 36 calibres, modules and models in our base take it. Rechargeable: replace it only with the same type.

Sources checked · How we source numbers
CTL621F: drawing to scaleCTL621F: diameter 6.8 mm, height 2.1 mm.Ø 6.8−+2.1CTL621F
CTL621F: face and edge view to scale, from the datasheet sizesDrawing from data, not a photo · mm
Diameter
6.8 mm1
Height
2.1 mm1
Nominal voltage
2.3 V1
IEC designation
not listed

CTL621F equivalents

Our sources list CTL621F under its maker's code only; a rechargeable cell has no primary equivalent.

Code systemCTL621Frechargeable
PanasonicCTL621F1

Size and chemistry

Diameter
6.8 mm1
Height
2.1 mm1
Nominal voltage
2.3 V1
Chemistry
Coin-type Cobalt Titanium Rechargeable Lithium Batteries1
IEC designation
not listed
2.1CTL621F2.1MT621
Every 6.8 mm rechargeable size with a page, edge view to scale. Only the height tells them apart.
Show CTL621F at true size (1:1)
1:1 · not calibrated: sizes are approximate
CTL621F: drawing to scaleCTL621F: diameter 6.8 mm, height 2.1 mm.Ø 6.8−+2.1CTL621F
01020304050

Cell types in this size

CTL621F

Rechargeable · Coin-type Cobalt Titanium Rechargeable Lithium Batteries1

1 code in our sources names this cell type.

Capacity by manufacturer

Panasonic CTL621FCTL621F

3.6 mAh1footnote *1: 'Based on standard drain and cut-off voltage down to 2.0V at 20' (datasheet)Datasheet ↗

Can I use another cell instead of CTL621F?

Verdicts follow our swap rules from the datasheet size, voltage and cell type.

Check any other pair

  • Use instead of CTL621F

    MT621

    No

    No: MT621 and CTL621F are different rechargeable systems.

    CTL621F is cobalt-titanium rechargeable, 2.3 V; MT621 is manganese-titanium rechargeable, 1.5 V. Use the type printed on the old cell or in the maker's table.

    MT621: 6.8 mm2 × 2.1 mm2, 1.5 V2

    Draw both cells in the swap checker

  • Use instead of CTL621F

    SR621SW

    Never

    Never: CTL621F is rechargeable, SR621SW is not.

    CTL621F is a cobalt-titanium rechargeable cell that the watch charges from its solar panel or generator. SR621SW is a primary silver oxide cell, not made to be charged. Replace it only with the same rechargeable type.

    SR621SW: 6.8 mm3 × 2.15 mm3 Sources disagree: manufacturer 2.15 mm / secondary source 2.1 mm4, 1.55 V3

    Draw both cells in the swap checker

What uses CTL621F

36 calibres, modules and models in our base name this size.

Movements4

Also: Citizen A060 (Eco-Drive), Citizen H145 (Eco-Drive, radio-controlled), Citizen H800 (Eco-Drive, radio-controlled), Citizen H804 (Eco-Drive, radio-controlled)

Citizen models27[5]

On 8 calibres, from Citizen's battery table.

  • H8007 models
  • A0604 models
  • H8744 models
  • H1454 models
  • H8042 models
  • E3652 models
  • H8642 models
  • H2462 models
The 27 model numbers

AQ4100-57B · AQ4100-57E · AQ4100-65H · AQ4106-18X · AT8020-03L · AT8020-54L · AT8189-61E · AT8220-55L · AT8227-56X · AT8260-51M · AT8265-57L · AT8267-51X · AT8287-62E · BN1014-55E · BN1015-52E · BY1010-57H · BY1010-57L · BY1010-57X · BY1018-55X · BY3005-56G · BY3006-53H · CB0241-00L · CB0248-01X · CB0260-56L · CB0285-63E · EC1180-81L · EC1183-16A

Watches with a page3

Warnings from the makers

Do not mix cells

“Avoid mixed use of batteries, i.e. new, used or differ- ent types.”[6]

Questions

Can I replace CTL621F with a regular battery?

No. CTL621F is a cobalt-titanium rechargeable cell that the watch charges from its solar panel or generator. SR621SW is a primary silver oxide cell, not made to be charged. Replace it only with the same rechargeable type.

What watches use the CTL621F battery?

In our base: 27 Citizen models; movements such as Citizen A060 (Eco-Drive), Citizen H145 (Eco-Drive, radio-controlled), Citizen H800 (Eco-Drive, radio-controlled). The full lists are on this page, with the brand tables they come from.

Sources

Documents checked · Report a wrong number

  1. 1Panasonic Energy Co., Ltd. — CTL621F Coin-type Cobalt Titanium Rechargeable Lithium Batteries (datasheet) · pdf · read
  2. 2Panasonic Energy Co., Ltd. — MT621 datasheet (EN) · pdf · read
  3. 3Murata Manufacturing Co., Ltd. — Watch Battery Selection Guide / Cross Reference (1 page) · pdf · read
  4. 4WatchBattery (UK) Ltd — Watch Battery Cross Reference Table · html · read
  5. 5Citizen Watch US — Battery Information (model / caliber / battery table) · html · read
  6. 6Panasonic Energy Co., Ltd. — Safety Warnings and Precautions (AAA4000COL13) · pdf · read