Allen-Bradley ControlLogix 1756-BATA 3.6V 19Ah Lithium PLC Replacement Battery Assembly

Module Overview

The 1756-BATA is a high-capacity lithium backup battery assembly specifically designed for the Allen-Bradley ControlLogix platform. This primary (non-rechargeable) battery is the heart of the 1756-BATM external battery module, providing significantly extended backup life compared to standard internal batteries. It is essential for maintaining critical system memory, including tags, configuration data, and user programs, during prolonged power outages or system shutdowns. Engineered for industrial environments, the 1756-BATA ensures that complex automation logic is preserved without the need for frequent maintenance.

Detailed Engineering Specifications

The 1756-BATA utilizes a dual-cell lithium-thionyl chloride chemistry to achieve its industrial-grade capacity and stability

• Battery Type: Lithium Primary (Non-Rechargeable)

• Output Voltage: 3.6 Volts DC

• Rated Capacity: 19,000 mAh (19 Ah)

• Configuration: 2-cell assembly with wire leads and keyed connector

• Total Lithium Content: Approximately 10 grams (5g per cell)

• Typical Service Life: Up to 299 days (Worst-case estimate for L55M12 controllers @ 25°C)

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: -40°C to 85°C (-40°F to 185°F)

• Mounting: Installed internally within the 1756-BATM external housing

• Physical Weight: 0.44 lbs (0.20 kg)

System Compatibility and Performance

The 1756-BATA is intended for use with legacy and mid-range ControlLogix controllers that require high-capacity backup, typically when internal battery options are insufficient for long-term storage requirements.

• Primary Controller Families: Compatible with 1756-L55 (ControlLogix 5555) and 1756-L6x (ControlLogix 5560) series.

• External Module: Must be used as the replacement battery for the 1756-BATM externally mounted battery module.

• Connectivity: A 1-meter cable typically connects the external battery module to the front of the controller.

Installation and Safety Guidelines

To ensure the integrity of the data and the safety of the hardware, the 1756-BATA should be handled according to strict industrial standards.

• Non-Rechargeable: Never attempt to recharge this battery. Attempting to apply voltage can lead to overheating, electrolyte leakage, or rupture.

• LED Status: The controller's "BAT" LED will illuminate when the battery voltage drops below a safe threshold. It is recommended to replace the assembly as soon as this indicator appears.

• Disposal: Due to the 10-gram lithium content, these batteries must be disposed of in accordance with local environmental regulations for hazardous materials.

• Redundancy Note: For newer controllers like the 1756-L7x or L8x series, which use energy storage modules (ESMs) and non-volatile memory, the 1756-BATA is generally not required.

Technical FAQ

Why would I use the 1756-BATA instead of the standard 1756-BA1 battery?

The 1756-BATA offers nearly 20 times the capacity of a standard internal battery. It is designed for systems that stay powered off for extended periods, such as seasonal production lines or remote installations where power reliability is low.

Can I replace the battery while the controller is running?

Yes. Replacing the battery in the 1756-BATM module while the controller has backplane power is safe and ensures that memory is never lost during the swap.

How often should I replace the battery if the BAT LED isn't on?

While the LED is the primary indicator, many maintenance programs proactively replace the 1756-BATA every 12 to 24 months depending on the ambient temperature of the enclosure.