Allen-Bradley 1756-BA2 Battery Assembly – ControlLogix Chassis Backup Power
When plant power fails unexpectedly, the difference between a controlled shutdown and catastrophic data loss comes down to one component: the backup battery in your ControlLogix chassis. Without a functioning 1756-BA2, your 1756-L series controller loses its user program, I/O configuration, and tag data the moment mains power drops — forcing a full cold restart, unplanned downtime, and potentially hours of re-commissioning work on a live production line. In process industries where a single unplanned stop costs tens of thousands of dollars per hour, this 3.0V lithium battery assembly is not optional equipment.
The 1756-BA2 is the factory-specified backup battery for the Allen-Bradley ControlLogix platform, Rockwell Automation’s flagship modular PLC family that anchors automation architectures across automotive, oil & gas, food & beverage, and discrete manufacturing worldwide. Within the 1756 series, the BA2 superseded the original BA1 chemistry, delivering extended service life and improved low-temperature discharge characteristics suited to both climate-controlled control rooms and harsh industrial enclosures. As ControlLogix installations continue to expand globally, demand for genuine replacement BA2 batteries remains consistent across MRO procurement channels.
Technical Specifications
Electrical
- Battery Chemistry: Lithium (Li/SOCl₂)
- Nominal Voltage: 3.0 V DC
- Typical Service Life: Up to 5 years (at 25°C, controller powered ≥8 hours/day)
- Self-Discharge Rate: <1% per year at 25°C
Mechanical
- Form Factor: Plug-in battery assembly with keyed connector
- Compatible Chassis: 1756 ControlLogix chassis (all slot counts)
- Weight: Approx. 100 g
Environmental
- Operating Temperature: 0°C to +60°C
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 5–95% non-condensing
Certifications & Standards
- UL Listed, CE Marked
- RoHS Compliant
- Meets IEC 60086 primary lithium battery standard
- Rockwell Automation factory part number: 1756-BA2
Key Features & Benefits
- Hot-swap capable design — The keyed connector and battery status LED on compatible 1756-L controllers allow replacement without removing the controller from the chassis, eliminating the need for a planned outage window.
- Up to 5-year service life — At standard duty cycles (controller energized ≥8 hours/day, 25°C), the BA2 chemistry delivers roughly 40% longer service life than the original BA1, reducing annual MRO battery replacement frequency across large ControlLogix fleets.
- Low self-discharge rate (<1%/year) — Shelf-stable lithium chemistry means batteries stored in a climate-controlled warehouse retain >95% capacity after 3 years, supporting strategic spare-parts stocking programs.
- Keyed polarity-safe connector — Mechanical keying prevents reverse-insertion damage, a critical safeguard during maintenance shifts when technicians may be working under time pressure.
- RoHS & IEC 60086 compliant — Meets EU hazardous substance restrictions and the international primary lithium battery standard, satisfying import compliance requirements for EU, UK, and most APAC markets.
- Direct factory replacement — Specified by Rockwell Automation as the OEM replacement for all 1756-L series controllers; no firmware or configuration changes required after installation.
Industry & Equipment Applications
- Automotive Manufacturing — Body-in-white welding lines, paint shop conveyors, and powertrain assembly cells running 1756-L61/L62/L71/L72 controllers where unplanned stops trigger line-wide cascade shutdowns.
- Oil & Gas — Wellhead RTU panels, pipeline SCADA nodes, and compressor station control cabinets where controllers may operate in remote locations with infrequent maintenance visits, making long battery life essential.
- Food & Beverage — CIP (Clean-in-Place) skid controllers, filling line PLCs, and cold-storage conveyor systems operating in washdown environments with frequent power cycling.
- Water & Wastewater — Pump station controllers and SCADA-integrated treatment plant PLCs that must retain programs through utility grid fluctuations and scheduled power maintenance.
- Pharmaceutical & Life Sciences — Validated manufacturing lines where controller program integrity is a GMP requirement and any unplanned memory loss triggers a deviation report and revalidation event.
- Discrete Manufacturing & Material Handling — Automated storage and retrieval systems (AS/RS), robotic palletizers, and sortation conveyors using ControlLogix as the primary motion and safety controller.
System Integration & Compatible Parts
Compatible Controllers (upstream): 1756-L61, 1756-L62, 1756-L63, 1756-L64, 1756-L65, 1756-L71, 1756-L72, 1756-L73, 1756-L74, 1756-L75, 1756-L81E, 1756-L82E, 1756-L83E, 1756-L84E, 1756-L85E.
Compatible Chassis (downstream): 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17 (all ControlLogix chassis form factors).
Predecessor / Cross-reference: The 1756-BA1 is the earlier-generation battery; the 1756-BA2 is a direct drop-in replacement with improved chemistry — no hardware or software modification required. Some third-party sources list equivalent batteries under generic lithium 3V ER34615 chemistry, but Rockwell Automation recommends using the factory-specified 1756-BA2 to maintain warranty and support coverage on the controller.
Related MRO items: 1756-BATA (battery tray assembly for older chassis revisions), 1756-L series controller firmware update cables (1784-U2DHP), and 1756-TBCH terminal block covers for chassis maintenance access.
Our Quality Assurance Process
Every 1756-BA2 unit shipped from Konmask.com passes through a four-stage verification process before dispatch:
- Source Verification — Units are sourced from authorized distributors or directly from Rockwell Automation-certified supply chains. Supplier documentation (purchase records, certificates of conformance) is retained on file.
- Visual & Mechanical Inspection — Each battery assembly is inspected for label integrity (part number, date code, lot number), connector condition, and absence of physical damage or electrolyte leakage.
- Date Code & Shelf Life Check — Manufacturing date codes are verified to ensure remaining shelf life meets or exceeds customer project timelines. Batteries within 12 months of end-of-shelf-life are not shipped without explicit customer acknowledgment.
- Documentation Package — Available upon request: Certificate of Conformance (CoC), Material Safety Data Sheet (MSDS/SDS), Rockwell Automation product datasheet, and packing list with lot traceability.
How to Order
- Submit your inquiry — Use the contact form on this page or email [email protected] with your required quantity, delivery destination, and any project timeline constraints.
- Receive your quote — Our team responds within 24 hours with pricing, available stock, lead time, and shipping options. For urgent MRO requirements, please indicate “URGENT” in your subject line.
- Confirm & ship — Once you approve the quotation, we process your order and dispatch with full tracking. Export documentation (commercial invoice, packing list, CoC) is included for international shipments.
Why Choose Konmask.com?
- Specialized in industrial automation components — We focus exclusively on PLC modules, DCS cards, and control system hardware. This is not a general electronics marketplace; our team understands the technical context of every part we supply.
- Traceable supply chain — Every unit comes with documentation linking it back to its source. We do not mix lots or substitute equivalent parts without explicit customer approval.
- Global export experience — We ship to customers across Asia, Europe, the Middle East, and the Americas, with experience navigating export documentation, customs requirements, and international freight options.
- Responsive technical support — Have a question about compatibility, installation, or cross-referencing an obsolete part number? Our team can provide engineering-level guidance, not just a datasheet link.
- Flexible procurement terms — Whether you need a single emergency replacement or a blanket order for annual MRO stock, we accommodate both spot buys and scheduled delivery programs.
Frequently Asked Questions
Q: How do I know when the 1756-BA2 battery needs to be replaced on my ControlLogix controller?
A: The 1756-L series controllers monitor battery voltage continuously. When voltage drops below threshold, the controller sets the Battery Low (BATLOW) status bit and illuminates the BAT LED on the controller faceplate. Rockwell Automation recommends proactive replacement every 3–5 years depending on operating temperature and controller duty cycle, rather than waiting for the low-battery alarm — particularly in critical process applications where an unplanned replacement would require a maintenance window.
Q: Can I replace the 1756-BA2 battery while the ControlLogix controller is running (hot-swap), and will I lose my program?
A: Yes, hot-swap replacement is supported on all current 1756-L series controllers. The controller retains its program in RAM during the brief period of battery disconnection because the internal capacitor provides short-term backup. However, Rockwell Automation recommends completing the swap within 30 seconds to avoid any risk of data loss. Always verify the BATLOW LED extinguishes after installing the new battery to confirm proper seating.
Q: What is the difference between the Allen-Bradley 1756-BA1 and 1756-BA2, and are they interchangeable?
A: The 1756-BA2 uses an updated lithium chemistry that provides longer service life and better performance at temperature extremes compared to the original 1756-BA1. Both use the same physical connector and are mechanically interchangeable in all 1756-L series controllers. Rockwell Automation discontinued the BA1 and designates the BA2 as the current replacement part. If you have BA1 batteries in your MRO stock, they remain usable until their shelf-life expiry date, but new procurement should specify the 1756-BA2.
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