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Product Introduction
When the substation DC supply fails, the last thing you want is your REC670 losing its timestamp accuracy. The ABB 1MRK004814-BC is the designated lithium backup module that keeps the clock ticking and critical event logs intact. It slots directly into the 1MRK004809-AA holder, acting as the silent guardian for your protection logic’s memory.This specific BC variant is actually clever—it uses a high-density Li-SOCl₂ chemistry. In deployments across aging transmission networks, we found it delivers a longer service life compared to standard alkaline backups. Honestly, it’s a small part, but replacing it before it hits zero voltage prevents a major headache during fault analysis.
Key Technical Specifications
- Output Voltage: 3.6 V DC
- Chemistry: Lithium-Thionyl Chloride (Li-SOCl₂)
- Compatible Holder: 1MRK004809-AA
- Primary Function: RTC power source, SRAM data retention
- Installation: Plug-in connection
- Physical Form: Cylindrical module
- Shelf Life: Typically >10 years (uninstalled)
- Operating Temperature: -40 °C to +85 °C (varies by holder spec)
Quality Control Process
Inbound Inspection
We verify the traceability against ABB packing lists. Every unit undergoes visual inspection for corrosion, swelling, or tampering marks. Since this is a chemical cell, we check the seal integrity closely—though your mileage may vary depending on how long it sat in a warehouse before reaching us.Functional Verification
While the battery itself doesn’t “boot,” we test the complete circuit. We insert the 1MRK004814-BC into a known-good 1MRK004809-AA holder and measure the output voltage with a Fluke 115 multimeter. We confirm >3.5V DC and check for stable contact resistance.Final QC & Packaging
After passing the voltage test, we seal the module in an anti-static bag with a desiccant pack. We can share test photos on request—transparency is key when dealing with EOL components.
Installation Pitfalls Guide
Replacing this battery isn’t rocket science, but cutting corners here leads to blown RTC settings.Firmware Version Mismatch
Well, technically the battery doesn’t have firmware, but the 1MRK004809-AA holder does. If your relay is complaining about “Battery Fault” after swap, it might be a holder communication issue, not the cell. Always reset the diagnostic register after replacement.DIP Switch / Jumper Misconfiguration
The holder often sits on the logic board with specific addressing. Take a photo of the holder’s position and surrounding board jumpers before pulling the old unit. Don’t assume it’s a universal plug-and-play spot.Power Supply Undersizing
This is rare for a battery, but if you’re replacing the entire holder assembly, check the current draw on the logic board. Adding a new holder shouldn’t overload the 5V rail, but verify you have 20% headroom if other modules are aging.ESD Damage
Lithium cells are sensitive to voltage spikes. Skip the wrist strap once, and a static discharge could puncture the cell seal or damage the holder’s monitoring circuit. Honestly, it’s not worth the risk—ground yourself.
