Px625a Battery

The PX625A (also known as LR9 or V625U) is the modern alkaline successor to the banned 1.35V mercury batteries. While it is widely available and affordable, its 1.5V output and declining discharge curve create significant accuracy issues for vintage camera light meters, which were calibrated for stable 1.35V power RedditCompany.

Product & Technical Insights

* Specifications: Features a 1.5V nominal voltage, alkaline chemistry, and a distinctive "stepped" disk shape (15.25mm diameter x 6.02mm height) GpbatteriesCompany.

* The Exposure Problem: Using a PX625A in a vintage camera (like a Canon F-1 or Leica M5) often leads to 1–2 f-stops of underexposure because the higher voltage causes the meter to over-read light Company.

* Professional Alternatives:

* WeinCell MRB625: A zinc-air battery that delivers a steady 1.35V, providing a "plug-and-play" solution for accuracy JoshualowcockPhotrio.

* MR-9 Adapter: A high-end tool that drops the voltage of modern Silver Oxide cells (1.55V) to exactly 1.35V ButkusPhoto.

Market Trends 2026

* Niche Stability: Demand remains robust within the analog photography enthusiast market, as collectors seek reliable ways to power vintage gear without mercury Pv-Magazine-Usa.

* Supply Chain Shift: Production has largely shifted to specialized alkaline and zinc-air manufacturers in Shenzhen, China, where bulk wholesale prices for standard PX625A cells range from $0.10–$0.11/piece Alibaba.

* Global Battery Growth: The broader battery market is projected to reach $177.4B by 2026, driven by high demand for specialized performance and reliability in small electronic sectors GrandviewresearchPv-Magazine-Usa.

I have compiled a list of specialized products, including direct alkaline replacements and technical adapters, in the files below.