The Seiko SBXZ001, powered by Seiko’s high-precision quartz chronograph caliber 9T82, is a watch we have always held in high regard. Known for its exceptional accuracy, smooth chronograph operation, and robust engineering, it represents a period when Seiko pushed quartz technology to an extraordinarily high level.

Over the years, we have serviced many of these watches, and one particular aspect has become central to keeping them operational: the capacitor.

Our Experience with 9T82 Capacitor Replacements

A few years ago, we successfully performed our first capacitor (often referred to as a rechargeable battery) replacement on a Seiko SBXZ001. That repair was fully successful, and the watch returned to normal operation, including flawless chronograph performance.

Following that initial success, we went on to replace capacitors in dozens of 9T82-powered watches. These services were completed to our standards, and customers received fully functional watches that met Seiko’s original performance specifications.

A Change in Supplied Parts

Approximately a year and a half ago, we began receiving capacitors that—while carrying the correct Seiko part number—were physically and electrically different from the original components.

Most notably, these newer capacitors have a smaller energy storage capacity.

At first glance, the watches appear to function normally:

• Timekeeping is stable
• The watch starts without issue
• Basic operation seems correct

However, once the chronograph is engaged, a critical problem emerges.

The Chronograph Power Issue

The 9T82 movement requires a significant power draw when the chronograph is running. With the newer, lower-capacity capacitors, the energy reserve is insufficient to sustain this load.

The result is consistent and reproducible:

• The chronograph starts normally
• After approximately 10 seconds, it stops
• The watch itself continues running

This behavior is not due to a fault in the movement, but simply because the capacitor cannot supply the required current.

Why We Cannot Offer This Repair (For Now)

This situation does not align with the level of service we aim to provide.

While we could technically replace the capacitor and return the watch in a partially functional state, doing so would mean delivering a chronograph that does not perform as designed. That is not acceptable to us, nor is it fair to our customers.

We have actively searched for:

• New old stock capacitors
• Alternative suppliers
• Compatible modern replacements with equivalent capacity

Unfortunately, to date, we have not been able to source a capacitor that matches the original specifications required for full 9T82 chronograph operation.