Batteries used

Batteries for military watches can be a major headache to everyone. I have compiled some info based on correspondence with other enthusiasts and also from my own experiences. Any help or assistance to add watches to this list or correct any details or omissions would be a great help to everyone. If you wish to add anything just email me at ian.crowley@military-watches.net

CWC G10 (all but the 1980/82 fat case) - SR920SW or SR927SW (371 or 395)


CWC 1982 Falklands Era G10 issue runs on the same 386 as the CWC fat case.
We are informed some watches from this period use a 344 battery.   It is easy to tell because the 386 is 4.2 mm high compared with 3.6 mm for the 344. However the hatch springs should hold the 344 OK so no problems if you slip up.

CWC Diver's - SR920SW or SR927SW (371 or 395)

CWC Batteries: The Information below might also be helpful and was emailed to be by a CWC collector

1979 to 1982 First pattern. Easy to identify quite rate and No oval logo on the dial. 13mm thick, crystal to caseback. AS/ESA 536.121 movement, no jewels. 386 battery. Battery hatch on centre line.

1982: Second pattern. Logo has oval. Everything else same as first pattern.

1983: Third pattern, variant A. Logo has oval. 11.8mm thick, crystal to caseback. ESA 947.121 movement, seven jewels. 386 battery. Battery hatch offset.

1984, 1985: Fourth pattern, variant B. Same as variant A except movement is ETA 555.112 (marked Marinium), battery is 394 and battery hatch is on centre line.

1987 on: Fifth pattern. Logo has oval. 10.2mm thick, crystal to caseback. ETA/ESA 955.114 movement (and other equivalents), seven jewels. 395 battery. Battery hatch on centre line. 

2000 on: Sixth Pattern. GS2000 Ronda 715li Movement which uses a CR2016 lithium battery. Cross reference to: 280-202, 280-204, 280-206, BR2016, CR2016, CR2016C, DL2016, FA, SB-T11 (this is some uncertainty regarding this model with some owners saying that the movement uses an ETA and others saying 715li which I am advised is in my watch so any clarification would be welcome and helpful to visitors to this site.


CWC (North America) G10: This watch is totally different to the CWC in Europe and uses a Ronda 705 movement which requires a 371 Watch Battery. Details of options follow: 1.55 volts, SILVER, 32 mAh, Height: 2.1 mm, Diameter: 9.5, Weight: 0.61 grams, Cross reference to: Duracell - D 371, Timex - N/A, Bulova - 605, Panasonic, Maxell, Sony, Toshiba - SR 920 SW, Renata - R 371/30, Seiko - SB-AN, Citizen - 280-31, Ray-O-Vac - RW 315, IEC - SR 69

Marathon Navigators and TSARs - (with ISA 1198 movement) - SR927SW (395) Cross Reference to: Toshiba SR927SW, Varta V395, Duracell D395, Philips 395, Rayovac 395, V395, D395, S926E, 610, LA, 280-48, SB-AP, SB-DP, SR57, D399, 399, SP395, SR57L, SR927, SR927W, TR927W, 523, 613, SP395, S28, 1162SO

Marathon TSAR, etc (with ETA F06.111) - SR920SW or SR927SW (371 or 395)

MWC / Military Watch Company

MWC G10 50m Battery Hatch Models all use Ronda 705 movements which require a 371 Watch Battery. Details of options follow: 1.55 volts, SILVER, 32 mAh, Height: 2.1 mm, Diameter: 9.5, Weight: 0.61 grams, Cross reference to: Duracell - D 371, Timex - N/A, Bulova - 605, Panasonic, Maxell, Sony, Toshiba - SR 920 SW, Renata - R 371/30, Seiko - SB-AN, Citizen - 280-31, Ray-O-Vac - RW 315, IEC - SR 69


MWC 100M Range 10 Year Battery and Ronda 715li Movement

MWC G10 100m Models with screw crown and caseback: These watches are fitted with a high performance Ronda 715li movement which uses a CR2016 lithium battery. Cross reference to: 280-202, 280-204, 280-206, BR2016, CR2016, CR2016C, DL2016, FA, SB-T11

MWC G10 EVO Digital /Analogue dual time Chronographs. These models are quite complex by the standard of most military watches with two separate movements and a use SR626SW in the analogue movement for which the alternative options are Energizer 377, SR626SW, SR66, SR626, SB-AW, 280-39, BA, V377, D377, 606, S626E, GP377, AG4, AG-4, 377, L626, SG4, LR626, LR66, SR628SW, E377, E377CA, LR626SW, 377A, SR262SW, 377X, 377S, GP177, SR6265W, 377/376, E377A, SR66SW, SR625SW and377BA. The Digital movement uses a CR2016 lithium battery. Alternatives are 280-202, 280-204, 280-206, BR2016, CR2016, CR2016C, DL2016, FA, SB-T11. Although the CR2016 is a very long life movement we recommend replacing both batteries if you do not have watchmaking skills.

MWC MKI, MKII, MKIII and MKIV Chronographs: Toshiba SR927SW, Varta V395, Duracell D395, Philips 395, Rayovac 395, V395, D395, S926E, 610, LA, 280-48, SB-AP, SB-DP, SR57, D399, 399, SP395, SR57L, SR927, SR927W, TR927W, 523, 613, SP395, S28, 1162SO

MWC divers models up to 2011 all used Ronda 715 movements, and the battery size is No. 371. Details of options follow: 1.55 volts, SILVER, 32 mAh, Height: 2.1 mm, Diameter: 9.5, Weight: 0.61 grams, Cross reference to: Duracell - D 371, Timex - N/A, Bulova - 605, Panasonic, Maxell, Sony, Toshiba - SR 920 SW, Renata - R 371/30, Seiko - SB-AN, Citizen - 280-31, Ray-O-Vac - RW 315, IEC - SR 69

MWC divers models from 2011 (best to check though if unsure) were fitted with the high performance Ronda 715li movement which uses a 10 year CR2016 lithium battery. Cross reference to: 280-202, 280-204, 280-206, BR2016, CR2016, CR2016C, DL2016, FA, SB-T11

Please Note: A few MWC divers watches also use an ETA movement although most are pre 2001 but it is worth keeping in mind and it might be worth checking if in doubt.

MWC Vietnam watch (metal or plastic) uses battery size is SR626SW the alternatives are Energizer 377 Battery which  is also a replacement for equivalent batteries: SR626SW, SR66, SR626, SB-AW, 280-39, BA, V377, D377, 606, S626E, GP377, AG4, AG-4, 377, L626, SG4, LR626, LR66, SR628SW, E377, E377CA, LR626SW, 377A, SR262SW, 377X, 377S, GP177, SR6265W, 377/376, E377A, SR66SW, SR625SW, 377BA, 

MWC G10A, G10 A/B, G10 A/S and old G10 ZA base models:
364 batteries, 1.55 volts, SILVER, 20 mAh, Height: 2.15 mm, Diameter: 6.8, Weight: 0.33 grams, Cross reference to: Duracell - D 364, Timex - T, Bulova - 602, Panasonic, Maxell, Sony, Toshiba - SR 621 SW, Renata - R 364/31, Seiko - SB-AG/DG, Citizen - 280-34, Ray-O-Vac - RW 320, IEC - SR 60

MWC G10LM, the G10 LM models from 2011 to current use a Energizer 377 Battery which  is also a replacement for equivalent batteries: SR626SW, SR66, SR626, SB-AW, 280-39, BA, V377, D377, 606, S626E, GP377, AG4, AG-4, 377, L626, SG4, LR626, LR66, SR628SW, E377, E377CA, LR626SW, 377A, SR262SW, 377X, 377S, GP177, SR6265W, 377/376, E377A, SR66SW, SR625SW, 377BA, CR626SW

Precista G10 - SR927SW (395) - Cross Reference to: Toshiba SR927SW, Varta V395, Duracell D395, Philips 395, Rayovac 395, V395, D395, S926E, 610, LA, 280-48, SB-AP, SB-DP, SR57, D399, 399, SP395, SR57L, SR927, SR927W, TR927W, 523, 613, SP395, S28, 1162SO


Precista G10 100m 2009 onwards from Time Factors: These watches are fitted with a high performance Ronda 715li movement which uses a CR2016 lithium battery. Cross reference to: 280-202, 280-204, 280-206, BR2016, CR2016, CR2016C, DL2016, FA, SB-T11

Precista Diver's (6645-99-757-3314) - SR927SW (395) - Cross Reference to: Toshiba SR927SW, Varta V395, Duracell D395, Philips 395, Rayovac 395, V395, D395, S926E, 610, LA, 280-48, SB-AP, SB-DP, SR57, D399, 399, SP395, SR57L, SR927, SR927W, TR927W, 523, 613, SP395, S28, 1162SO

Precista Diver's (6645-99-426-0190 and 6645-99-891-0585 only) - CR2016 Cross reference to: 280-202, 280-204, 280-206, BR2016, CR2016, CR2016C, DL2016, FA, SB-T11

Pulsar G10 - SR920SW (371)

RAF Seiko Gen 1 and Gen 2 Chronographs - Sony SR927W or SR927SW (399 or 395)

Sandy 590 runs on a 371 Battery

AS32 Movement - Military Watches fitted with the AS32 (Solar movement) can be very confusing because Seiko, Citizen and Pulsar use various different codes for the same movement. This movement often crops up in Citizen and Pulsar watches such as the Pulsar PX3037 b but other military brands such as MWC and several others use them too. The part number for the capacitor 302624T cross references to Citizen Capacitor 295.37 (MT621 is also the same) most good watchmakers will figure this out or take the details directly from the capacitor itself. The other complication is that there are various brands of the capacitor itself for example the one below is Panasonic.


Traser P6500 models also MWC, Luminox (Ronda 515 Movement) SR927SW (395)

Traser P6502 (Ronda 715) SR927SW (395)

Traser or MWC Military Version (12/24 dial) P6506 (Ronda 715li movt) CR2016 lithium battery. Cross reference to: 280-202, 280-204, 280-206, BR2016, CR2016, CR2016C, DL2016, FA, SB-T11