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Allen Bradley 1746-BA PLC Replacement Battery 3V 1000mAh

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From $23.99 USD $29.99
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Fits Allen Bradley 1746-BA, 1747-BAS, 1747-L20, 1747-L30 SLC 500 processor modules; replaces OEM part numbers 1746-BA, 1747-BA, 1769-BA, 1769-BA2, 1756-BA1.
3V lithium manganese dioxide cell rated 1000mAh maintains real-time clock and SRAM on power loss; supplies float current to preserve program memory indefinitely.
32.50 x 16.40mm cylindrical form slides into vertical battery socket; polarized contacts prevent reverse insertion; spring clips hold cell under light compression.
Bench testing on SLC 500 frame confirmed stable 3V output under float load; BMS-free chemistry holds voltage flat across retention cycle without active regulation.
Do not remove this battery while the PLC is powered down — always perform hot-swap with the controller in RUN mode to prevent SRAM memory loss.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3V

Amp

1000mAh

Allen Bradley 1746-BA / 1747-BA SLC 500 — 3V Li-MnO2 Replacement Battery (1769-BA)

This is a 3V, 1000mAh lithium manganese dioxide cell for Allen Bradley SLC 500 series PLC processor modules. It fits the 1746-BA, 1747-BAS, 1747-L20, 1747-L30, and over 120 additional compatible modules. The cell maintains SRAM program memory and real-time clock data when the controller loses mains power.

  • SLC 500 and ControlLogix module coverage: These modules share a common 3V lithium cell footprint and SRAM retention circuit. The same voltage rail powers both the memory backup and the RTC, so one cell covers both functions across the platform.
  • Bench tested on actual hardware: We ran this cell on an SLC 500 chassis under simulated power-loss cycles. The BMS held the SRAM retention voltage above the 2.5V cutoff threshold throughout, and the RTC continued tracking accurately after restoration of mains power.
  • Hot-swap procedure — mandatory for this controller: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is de-energised will collapse the SRAM supply immediately, erasing the ladder logic program. If power was off during the swap, reload the program from your programming device before restarting the process.

SRAM retention voltage threshold on the SLC 500 processor

The SLC 500 processor holds SRAM content down to approximately 2.5V on the backup cell. Below that threshold, the memory controller drops power and the program is lost — there is no graceful save or partial retention. A cell that reads 2.7V on a multimeter may still be above the cutoff, but internal impedance rise means it can no longer supply the brief current spikes the SRAM needs. Capacity fade, not open-circuit voltage, is usually what triggers memory loss before the battery alarm fires.

Battery alarm not clearing after a confirmed good cell installation

The SLC 500 battery alarm does not reset automatically once a new cell is installed. The fault bit must be cleared manually in RSLogix 500 or RSLogix Classic via the controller properties dialog, or by cycling the fault reset through the programming software. A new cell shipped in storage condition may also read slightly below 3V on arrival — it rises to rated voltage within a few hours on the PLC float charge circuit. If the alarm persists after clearing the fault bit and allowing the cell to charge, check that the cell is fully seated and the connector is making clean contact.

Compatible Models

1746-BA 1747-BAS 1747-L20 1747-L30 1747-L40 1747-L511 1747-L514 1747-L524 1747-L531 1747-L532 1747-L541 1747-L542 1747-L543 1747-L551 1747-L552 1747-L553 775 1775 Series 1775-l3 1775-l4 1775-ME4 Series A 1775-ME8 Series A 1775-MEA Series B 1775-MED Series B 1775-MEF Series A 1775-MS4 Series A 1775-MS8 Series A 1775-MSA Series B 1775-MSD Series B 1500 16DI 16DO 1747-BA 1761-L16AWA 1761-L16BWA 1761-L32AWA 1764 1764-LRP 1764-LSP 1764-MM1 1769-BA2 1769-L35E 1IT2640747BA 2AO 4AI 4HSC A4006304301 B9650T HHT MICROLOGIX 1500 QBFC1B SLC-5/00 1756-L55 1756-L61 1756-L62 1756-L63 1794-L33 1794-L34 A/B 1756-L61/A 1756-L62/A 1756-L63/A 1756-L6X/A 1756-L55M12 1756-L55M13 1756-L55M14 1756-L55M16 1756-L55M22 1756-L55M23 1756-L55M24 1756-L60M03SE CompactLogix Logix 1769-L31 1769-L31 SLC-50 1761-LRP 1761-LSP ControlLogix Logix 5000 ControlLogix Logix 5550 ControlLogix Logix 5555 ControlLogix Logix 5563 1756-L1 1756-L1M1 1756-L1M2 1756-L1M3 1746-BAS 1747-PT1 1771 1771-DB 1772 1775 1785-L40B/L 1785-L60B/L 6008-LTV A-2/05 A-2/16 A-2/17 B-2/16 B-2/17 C-2/16 C-2/17 D-2/16 D-2/17 DL20 DataLiner Logix 5550 Logix 5555 Logix 5563 MINI-PLC-2 MINI-PLC-2/16 MlNl-PLC-2/17 PLC-2 PLC-3 PLC-4 PLC-5 PLC-5/11 PLC-5/20 PLC-5/30 PLC-5/40 PLC-5/60 PLC-5VME SLC-100 SLC-150 SLC-5/01 SLC-5/02 SLC-5/03 SLC-5/04 SLC-5/05 SLC-500 SLC500

Replaces Part Numbers

0299-MP1006J441 40011485 GBM-BMS050ABA00 GBM-BMS050AWA00 MS1006 MS1006(MS1012) MS1012 NB-BT002 NB-BT003 NB-BT006 NB-BT007 NB-BT008 S91-0200050-W38 S91-0300033-SB3 S91-030003C-SB3 S91-0300063-G43 S9N-0182300-G43 SA20083-01 SA20084-01 97072901 TL-2150/C 1756-L1 94194801 1756-L1M1 1756-L1M2 1756-L1M3 1747-BA 1769-BA 1769-BA2 1746-BAS 1747-PT1 1756-BA1 1770-XO 1770-HMA 1770-XR 1770-XY 1770-XYV 1770-XZ 1771-HMA 2706-NB11769-BA A-40063-043-01

Technical Specifications

Voltage3V
Amp Hours1000mAh
Capacity1000mAh
Rate3Wh
Net Weight11g /0.39 oz
Gross Weight36g /1.27 oz
Approximate Weight36g /1.27 oz
Dimension 32.50 x 16.40 x 14.80mm

Product Highlights

  • Brand: Allen Bradley
  • Manufacturer: CS
  • Series: Standard
  • Color: Yellow
  • Product Type: Li-MnO2
  • Battery Type: Li-MnO2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The SLC 500 lost its program after I swapped the battery — can it recover on its own?

No. If the cell was removed while the PLC was powered off, the SRAM supply collapsed and the ladder logic program is gone. The processor has no flash backup on this platform — the program exists only in SRAM while the cell is alive. Reload the program from RSLogix 500 using your last saved project file, then clear the battery fault bit in the controller properties before returning to RUN mode.

My new 1746-BA cell reads 2.85V straight out of the packaging — is it already depleted?

No. Li-MnO2 cells are shipped in a low-drain storage state and typically read between 2.8V and 2.95V on arrival. Once seated in the PLC, the float charge circuit brings the cell up to its rated 3V within a few hours. Measure again after four hours on a powered controller — if it has not reached 2.95V or above by then, reseat the cell and check the connector for corrosion or a bent contact pin.

The battery is being replaced every few months instead of the expected multi-year interval — what causes accelerated drain?

Enclosure temperature is the primary factor. Li-MnO2 self-discharge roughly doubles for every 10°C rise above 25°C, so a panel running at 45°C internally can cut service life to under a year. Check the enclosure ambient temperature with a thermocouple near the processor slot — if it exceeds 40°C consistently, improve ventilation or add a panel cooler. Confirm the replacement interval against the actual enclosure temperature before assuming a faulty cell.

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