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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The Cartier Tank Must SolarBeat keeps the Tank’s rectangular design but replaces a conventional quartz power system with a photovoltaic movement: light passes through openings in the dial to a cell beneath it, which recharges the battery. Cartier says a full charge provides about five months of autonomy and that the watch can run for at least 16 years without battery replacement. Those are manufacturer figures, not independently verified guarantees.
How the SolarBeat movement works
Cartier describes SolarBeat as a Swiss-made photovoltaic movement. Its 2024 user guide says it works with natural and artificial light: light passes through the perforated dial to a photovoltaic cell underneath, and the battery stores the resulting energy. Cartier notes that the recharge rate depends on light exposure, so the system relies on the watch receiving light over time rather than on a fixed charging schedule.
Cartier states that a fully charged battery has about five months of autonomy. The guide also says SolarBeat can operate for at least 16 years without battery replacement, comparing that figure with eight years for Cartier’s high-autonomy quartz movement and three years for its classic quartz movement. These are Cartier’s stated figures; they do not establish how long every individual watch will run under every pattern of light exposure or operating condition.
For the mechanism and its operating guidance, see Cartier’s 2024 Tank Must SolarBeat user guide.
#1 Best Overall
- Automatic Mechanical Movement: Manufactured with self-winding feature
- Movement Caliber: 1847 MC
- Case Material: Steel, Crown with Synthetic Spinel
- Dial & Hands: Silvered Flinque Dial, Blued-Steel Sword-Shaped Hands
- Strap & Buckle: Interchangeable Black Calfskin Strap, Steel Deployant Buckle
Tank Must SolarBeat sizes and documented configurations
Cartier lists a small case and a larger case. The documented large references share dimensions, but differ in how they attach to the wrist.
| Reference | Case | Dimensions and thickness | Published configuration |
|---|---|---|---|
| WSTA0121 | Small | 29.5 × 22 mm; 6.6 mm thick | Steel bracelet |
| WSTA0122 | Large | 33.7 × 25.5 mm; 6.6 mm thick | Steel bracelet |
| WSTA0120 | Large | 33.7 × 25.5 mm; 6.6 mm thick | Black calfskin strap with steel ardillon buckle |
Cartier’s listings describe the small WSTA0121 with a silvered dial, blued-steel sword-shaped hands, folding buckle and a synthetic cabochon-shaped spinel in the beaded crown. The large bracelet WSTA0122 also has a silvered dial and blued-steel sword-shaped hands. The small reference’s specifications are on Cartier’s WSTA0121 listing; Cartier lists the large bracelet WSTA0122 and large calfskin WSTA0120 separately.
Rank #2
- Imported
- Pre-Loved Condition: Excellent; Faint signs of wear.
- Case Size/Width: 20mm, Watch Height: 6mm, Band Width: 15mm, Wrist circumference: 5.5"
- Band material: Stainless Steel
- Case material: Stainless Steel
Choosing between the small and large case
The stated dimensions are the clearest basis for comparing fit: the small is 29.5 × 22 mm, while the large is 33.7 × 25.5 mm. Cartier’s published information does not include wearer-fit testing, so wrist presence and comfort cannot be inferred reliably from the measurements alone. If possible, try both sizes on your wrist rather than treating “small” and “large” as universal fit descriptions.
After choosing a case size, consider the attachment. The documented small configuration and one large configuration use steel bracelets; the other large configuration uses a black calfskin strap and steel ardillon buckle. The available evidence does not establish third-party strap compatibility.
Rank #3
- Cartier Baignoire Mini Model Silver Dial Watch WGBA0041
Water resistance and everyday use
Cartier publishes a water-resistance rating of 3 bar—approximately 30 metres—for the listed small and large configurations. That is a specification, not a promise that the watch is suitable for swimming or diving. The product information cited here does not define a broader activity recommendation.
For the photovoltaic system, the practical consideration is whether your routine gives the watch regular exposure to light. Cartier says the movement accepts daylight and artificial light, and that charging depends on exposure; it does not provide a universal charging interval for every owner or lighting environment.
Rank #4
- PREMIUM MATERIAL: Our strictly selected high quality durable silicone rubber and 304 stainless steel to make these watch bands. They are soft and comfortable, sweat and water resistant, lightweight and easy to dry, flexible yet fairly sturdy. Perfect for your any type of workout or daily use.
- COMPATIBILITY: The flexible replacement watch band is Compatible with Cartier watch Must 21 Chronoscaph Autoscaph series W10125U2, W10147U2, W10184U2, W10197U2, W10198U2.
- OPTIMAL FIT AND EASILY SWAP: Adjustable length design, the watch strap Length 115mm+95mm (counting the length of buckle), size can be adjusted according to the circumstance of individual wrist. Fits wrist circumferences ranging from 5" to 8" (127mm-203mm). Specialty tool is also supplied to assist you in removing your old band, which lock your watch precisely and securely.
- WHAT YOU GET: 1 Watch Band, 1 Spring Bar Remover Tool, 2 Screwdriver Tool.
- CUSTOMER SERVICE: Your satisfaction and the establishment of reputation are our pursuit. If you have any questions or concerns, please feel free to contact us. We will reply to you within a short period of time.
SolarBeat or conventional quartz?
SolarBeat is the light-recharged photovoltaic option in the Tank Must range described by Cartier’s guide. Cartier also gives autonomy figures for its high-autonomy and classic quartz movements, but those comparisons are manufacturer statements, not independent head-to-head tests. The meaningful choice is whether you prefer SolarBeat’s light-charging system and can expose the watch to light regularly, or would rather choose a conventional quartz category.
SolarBeat was introduced with the Tank Must release in 2021, as covered by Hodinkee’s August 2021 launch coverage. The 16-year battery-replacement statement remains Cartier’s claim. No independent reliability dataset or controlled runtime comparison is established by the sources cited here, so isolated reports are not enough to conclude that SolarBeat has a widespread defect—or that it is trouble-free.
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Quick Recap
Best Value
- Fit wrists size from 5 to 8 inches
- Selected high-grade silica gel, soft and odorless, smooth and non-scratching
- Package Included: Kevisae rubber watch band strap for 20mm cartier watch with silver buckle, free spring bar removal tool
- Please confirm the size of your watch interface before placing an order to avoid buying the wrong size strap
- Please feel free to contact us,if you have any questions,we will solve it as soon as possible
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
