S7 200 Battery

The Siemens S7-200 battery module (6ES7291-8BA20-0XA0) is a legacy component with high demand in the secondary and maintenance markets due to its discontinued status. While modern Siemens PLCs like the S7-1200/1500 have moved toward non-volatile memory and supercapacitors, the S7-200 remains critical in many operating industrial environments, driving a specialized market for spare parts and high-quality replacements. IndustrialmonitordirectIqelectroIqelectro

Product Overview & Performance

• Dual Retention System: The S7-200 uses an internal supercapacitor for short-term backup (typically several days to 10 days) and the optional BC 291 battery module for long-term retention of retentive data (V memory, RTC, timers) for up to 10 years. Iqelectro
• Critical Failure Point: A depleted battery is the leading cause of memory loss in S7-200 systems, often resulting in "SF" LED faults or loss of program parameters during extended power outages. RedditIndustrialmonitordirect
• Maintenance Standards: Technical benchmarks suggest a minimum voltage of 2.2 V for module health; replacement is generally recommended every 5 years to ensure reliability. Eichler-ServiceSiemens

Market Trends & Insights (2025-2026)

• Surplus Market Volatility: As official Siemens production has ceased, prices for original modules have surged, with industrial surplus prices reaching approximately $299 USD. Iqelectro
• Rise of Third-Party Solutions: The market is seeing an influx of high-quality third-party replacement modules and "conversion" kits that allow older EPROM systems to use battery modules for more stable data retention. IndustrialmonitordirectAmazon
• Transition Strategy: Many facilities are migrating toward "scalable and sustainable" battery ecosystems, but the massive installed base of S7-200 units ensures a steady demand for PLC-200 cartridge batteries through 2026. CoherentmarketinsightsThebatteryshow

The following file includes a list of verified suppliers specializing in Siemens PLC modules and accessories to assist with your sourcing needs.