Allen-Bradley 1769-BA Battery Assembly — 3V Lithium Memory Backup Battery for CompactLogix 1769-L2x / L3x Controllers

Product Overview

The Allen-Bradley 1769-BA​ Battery Assembly, manufactured by Rockwell Automation under the Allen-Bradley brand, is a dedicated 3.0 V primary lithium backup battery designed exclusively for use with CompactLogix 1769 series programmable logic controllers (PLCs), including the 1769-L20, 1769-L30, 1769-L31, 1769-L32E, 1769-L32C, 1769-L35E, and 1769-L35CR processor units. The primary function of the Allen-Bradley 1769-BA​ is to provide continuous low-current DC power to the volatile RAM (random access memory) and real-time clock circuitry inside the CompactLogix CPU when the main 24 V DC supply is removed, thereby preserving the user application program, tag data tables, retentive integers, and controller configuration parameters until normal power is restored.Unlike rechargeable backup cells, the Allen-Bradley 1769-BA​ is a non-rechargeable lithium-manganese dioxide (Li-MnO₂) or lithium-thionyl chloride cell (depending on production batch) housed in a small plastic shell with pre-attached wire leads and a polarized two-pin connector that mates directly with the battery port behind the controller’s front access door. When the controller is powered, the battery experiences negligible drain; during prolonged power outages it can sustain memory contents for typically 1 to 3 years at 25 °C ambient, depending on RAM size and temperature. The Allen-Bradley 1769-BA​ is recognized by the CompactLogix firmware, which continuously monitors battery voltage and illuminates the front-panel BATT LED—and optionally raises a minor fault—when the cell approaches end-of-life, giving operators advance notice to schedule a hot-swap replacement while the processor remains energized.Supplied as a genuine Rockwell Automation spare part, the Allen-Bradley 1769-BA​ meets stringent industrial quality and safety standards and is the only approved battery for 1769-series CompactLogix controllers; using substitute or incompatible batteries such as the SLC 500 1747-BA may result in incorrect fitment or inadequate voltage monitoring. For plant maintenance teams, keeping a stock of Allen-Bradley 1769-BA​ batteries on hand is a low-cost, high-impact measure to prevent unexpected program loss and reduce unplanned downtime during control cabinet power interruptions or scheduled outages.

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Description

 

Technical Specifications

Product Model | 1769-BAManufacturer | Rockwell Automation / Allen-BradleyProduct Type | CompactLogix Controller Memory Backup Battery Assembly (Primary Cell)Nominal Voltage | 3.0 V DCCell Chemistry | Lithium Manganese Dioxide (Li-MnO₂) — Non-rechargeable Primary CellTypical Capacity | 850 mAh (typical, varies by cell supplier; range 750–1200 mAh)Connector Type | 2-pin polarized connector with ~150 mm (6 in.) flying leadsCompatible Controllers | CompactLogix 1769-L20, L30, L31, L32E, L32C, L35E, L35CR (Series A/B)Operating Temperature (Cell) | -20 °C to +60 °C (-4 °F to +140 °F)Storage Temperature | -40 °C to +85 °C (10-year typical shelf life)Expected Backup Duration | 1–3 years @ 25 °C with controller powered down (depends on RAM load & temp.)Battery Low Detection | Monitored by CompactLogix CPU; BATT LED & optional fault on low voltagePhysical Dimensions (Battery Only) | Approx. Ø14.5 × 25.0 mm (1⁄2 × 1 in. AA-size cell in holder)Weight | Approx. 20–30 g (0.05 lb)Certifications / Compliance | RoHS, CE marked, complies with IEC 60086 & UN 3091 transport regulationsCaution Note | Not rechargeable; do not incinerate; recycle per local regulation

Main Features and Advantages

Precision Memory Retention:The Allen-Bradley 1769-BA​ delivers a stable 3.0 V output with extremely low self-discharge, ensuring that the CompactLogix controller’s volatile memory—containing the user’s ladder/logic programs, add-on instructions, produced/consumed tag data, and retentive variables—remains intact through extended mains-power outages. This eliminates the need to reload projects from a programming terminal after every planned shutdown.Integrated Voltage Monitoring by CPU:CompactLogix processors actively sense the voltage supplied by the Allen-Bradley 1769-BA. When the cell voltage drops below the preset threshold (typically ~2.4–2.6 V), the controller activates the front-panel BATT LED and can be configured to trigger a Minor Fault, allowing maintenance personnel to proactively replace the battery before data corruption occurs. This built-in diagnostics feature is a key advantage over generic third-party cells lacking proper connector pin-out or voltage reporting compatibility.Hot-Swap Replacement Under Power:The Allen-Bradley 1769-BA​ is designed to be replaced while the CompactLogix controller remains powered ON. Performing the swap with the CPU energized ensures uninterrupted RAM power through the brief changeover interval, preventing accidental loss of the loaded application. Clear instruction labeling on the controller door reinforces this critical procedure.Genuine OEM Fit and Reliability:The molded connector and lead length of the Allen-Bradley 1769-BA​ are engineered to seat positively in the designated battery receptacle of the 1769 controller without strain on the PCB header. Using the authentic Allen-Bradley part avoids risks of reverse polarity damage, loose contacts, or incompatibility warnings that can arise with aftermarket substitutes.Long Shelf Life and Industrial Packaging:With an approximate 10-year shelf life when stored in cool, dry conditions, the Allen-Bradley 1769-BA​ can be kept in spares inventory for years without significant capacity degradation. Each unit ships in anti-static, ESD-safe retail packaging with part-number labeling for easy identification in the MRO storeroom.Safety and Environmental Compliance:The lithium primary cell in the Allen-Bradley 1769-BA​ conforms to international transport and safety standards (including UN 3091 for lithium metal batteries shipped with equipment). End-of-life disposal should follow local regulations for lithium batteries to recover materials and prevent environmental harm.

Application Field

The Allen-Bradley 1769-BA​ is specified wherever a Rockwell Automation CompactLogix 1769-series processor is deployed and the application demands retention of the control program and data through power-down events. In discrete manufacturing—such as automotive assembly lines, packaging machinery, converting equipment, and CNC auxiliary controls—the Allen-Bradley 1769-BA​ safeguards machine sequences, recipe tables, and axis tuning parameters so that production can resume immediately after a line stoppage or cabinet power cycle without re-downloading from an engineering workstation.In process skids, water/wastewater lift stations, and building automation subsystems that use the CompactLogix L3x family for pump control, valve sequencing, or HVAC interlocks, the Allen-Bradley 1769-BA​ maintains setpoints, alarm thresholds, and totalizer values across utility outages. Material handling systems—including conveyor networks, sortation loops, and palletizers—rely on the Allen-Bradley 1769-BA​ to preserve encoder home positions and job-select registers between shifts or during weekend shutdowns.Because the Allen-Bradley 1769-BA​ is the only battery validated by Rockwell Automation for these controllers, it is also routinely included in site-standard spare-parts lists and preventive-maintenance schedules (typically replaced every 3–5 years or upon BATT LED activation) to comply with plant asset integrity programs. It is important to note that newer CompactLogix 5370 (1769-L30ER, etc.) and 5380 (5069-Lxxx) families employ supercapacitor-based or non-volatile Flash memory retention and do NOT use the Allen-Bradley 1769-BA; purchasers must confirm their controller model belongs to the original 1769 CompactLogix L2x/L3x generation before ordering.

Related Products

  • 1769-L30​ / 1769-L31​ / 1769-L32E​ / 1769-L35E​ — CompactLogix processors that accept the 1769-BA​ battery in their front battery compartment; the battery is required for RAM program retention on these units.
  • 1769-L20​ / 1769-L35CR​ — Older CompactLogix controllers also compatible with the 1769-BA​ battery assembly for memory backup.
  • 1747-BA​ — SLC 500 series processor backup battery (3 V, different connector/pinout); NOT interchangeable with the 1769-BA—do not use in CompactLogix controllers.
  • 1756-BA1​ — ControlLogix 5550/5553 (1756-L1/L55) processor backup battery; for legacy ControlLogix racks, not compatible with 1769 CompactLogix.
  • 1756-BA2​ — ControlLogix 1756-L6x/L7x series backup battery; also not compatible with 1769-series, listed here to avoid confusion with the 1769-BA.
  • 1763-BA​ — MicroLogix 1100 (1763-LxxA) processor backup battery; smaller form factor, not interchangeable with the 1769-BA.
  • 1769-PA2​ / 1769-PB2​ — 120/240 V AC and 24 V DC power supplies for the 1769 I/O rack; the 1769-BA​ plugs into the CPU, not the power supply, but both are typically stocked together as 1769-system spares.
  • 1769-IF8​ / 1769-OW16​ — Example analog input and relay output modules in the 1769 Compact I/O series, often installed on the same rack as a 1769-BA-equipped processor.
Contact Us WhatsApp / Wechat：+86 18150087953
Phone：+86 18150087953
Email：sales@cxplcmro.com

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