The Lotus 15802 watch uses a SR927SW button cell, which is a silver oxide battery specifically designed for quartz watches. It is a very common and reliable battery, widely used by major watch brands like Seiko, Tissot, and Omega.
Technical specifications of the SR927SW battery:
- Voltage: 1.55 V (very stable throughout its lifespan)
- Chemistry: silver oxide
- Capacity: 51 mAh
- Dimensions: 9.5 x 2.6 mm
- Lifespan: approximately 2 to 3 years depending on watch usage
Commercial equivalents: If you cannot find an SR927SW battery, you can use its direct equivalents: the references 395, 399, SR927W, SR927PW, AG7, or SR57. Make sure to purchase a silver oxide battery to maintain the reliability and performance of your watch.
Where to buy the battery: You can easily find SR927SW batteries at authorized Lotus dealers, jewelry stores, watchmakers, pharmacies, and online. Trusted brands like Renata or Energizer offer this reference at a good price.
Battery replacement: It is highly recommended to have the battery replaced by a professional, such as an authorized Lotus watchmaker or dealer. This ensures that the watch remains waterproof and that the case is not damaged during opening. Professional replacement usually costs only a few euros.
Longevity of your watch: The SR927SW silver oxide battery provides very good voltage stability throughout its lifespan, ensuring optimal accuracy of the quartz movement in your Lotus 15802. Regular battery changes every 2 to 3 years help keep your watch in excellent working condition.

![Lotus 15802 - [Measuring time with the chronograph] - 1](/content/2026/02/384412/images/50554cbebc816a606a8bf70a4fdda6467606035f557fe15dabbe6e9870ab763f.jpg)

