Why the 1756-BA2 Matters More Than You Think
A processor that loses its memory on power-down costs you far more than the battery that prevents it. The Allen-Bradley 1756-BA2 is the ControlLogix lithium metal battery assembly that keeps stored information in non-volatile memory and the internal clock alive when a Series B 1756-L6x controller is powered down. For plants running oil, gas, and industrial automation lines, that small cell protects program logic, configuration, and time-stamped data.
This assembly is built around a Duracell lithium battery cell (DL 2/3A) rated 3V with 1200 mAh capacity, terminated with wire leads to a connector. It is a direct-fit part for the 1756-L6x Series B controller family, not a generic coin cell.
What You Get in the Box
- Allen-Bradley 1756-BA2 lithium battery assembly
- Duracell DL 2/3A lithium cell, 3V, 1200 mAh
- Wire-leads-to-connector termination
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand / Manufacturer | Allen-Bradley / Rockwell Automation |
| Series | ControlLogix |
| Part Type | Lithium Battery |
| Supply Voltage | 3V DC |
| Battery Capacity | 1200 mAh |
| Termination | Wire Leads to Connector |
| Minimum Lifespan | 3 years at 0 to 35 °C (0 to 95 °F) |
| Storage Temperature | 25 °C (77 °F) recommended; -45 to 85 °C for under 30 days |
| Storage Humidity | 40–60% non-condensing |
| Weight | Approximately 36 g |
| Dimensions | 0.68 in x 1.38 in |
1756-BA2 vs. Other ControlLogix Battery Options
| Feature | 1756-BA2 | Generic coin cell | Non-OEM assembly |
|---|---|---|---|
| Designed for 1756-L6x Series B | Yes | No | Varies |
| Cell type | Duracell DL 2/3A | Varies | Varies |
| Rated capacity | 1200 mAh | Often lower | Often unverified |
| Termination | Wire leads to connector | None | May not match |
| Documented lifespan | 3 years at 0–35 °C | Not specified | Not specified |
Generic cells may fit physically but rarely match the connector, capacity, or documented lifespan. When a controller loses its clock or memory, downtime and reprogramming costs dwarf the price difference.
Where the 1756-BA2 Fits
Oil & Gas Control Cabinets
Series B 1756-L6x controllers often sit in remote cabinets where power cycling is routine. The 1756-BA2 keeps the clock and memory intact through outages, so operators return to a known state.
Continuous Process Lines
On lines that run 24/7, a battery failure can trigger an unexpected processor fault. Replacing the assembly on a planned interval avoids unplanned stoppages.
Legacy ControlLogix Upgrades
When upgrading or recommissioning existing Series B racks, the 1756-BA2 is the correct replacement part rather than a substitute cell.
Installation and Handling Notes
The assembly mounts horizontally in the controller chassis with the wire-leads-to-connector termination. Follow the manufacturer’s manual for replacement intervals and handling. Lithium metal cells should be stored per the recommended conditions: 25 °C (77 °F) at 40–60% non-condensing relative humidity, or -45 to 85 °C for storage under 30 days. Do not exceed 85 °C. Inspect periodically and replace on schedule — a practical, low-cost way to protect your controller investment.
Sourcing the 1756-BA2
Oil AutoTech supplies ready-to-ship industrial automation spares, including ControlLogix battery assemblies, with fast dispatch worldwide. If you are unsure whether your rack uses the 1756-BA2 or another battery type, our team can help confirm the correct part for your controller. Contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
