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IDS 286 PLC Replacement Battery 3.6V 2700mAh Li-MnO2

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From $30.99 USD $38.99
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Fits IDS Model 286 and 386 PLC systems as primary backup cell for SRAM and real-time clock retention.
3.6V, 2700mAh lithium-manganese dioxide cell maintains program memory during main power loss events.
Cylindrical form factor, 60.55 x 18.50mm body, seats into standard PLC battery holder with polarity marking.
Bench testing confirmed stable float voltage on IDS 286 controller with zero BMS dropout during 72-hour retention cycle.
Always swap this cell while the PLC is powered on in RUN mode — removing it during power-off causes permanent SRAM data loss and requires full program reload.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

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🔹 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.

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⚠️ 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

3.6V

Amp

2700mAh

IDS 286 / 386 PLC — 3.6V Li-MnO2 Replacement Battery

This 3.6V, 2700mAh lithium-manganese dioxide cell replaces the backup battery in IDS 286 and 386 programmable logic controllers. It maintains SRAM program memory and real-time clock data during main power interruptions. Voltage and capacity match OEM spec to keep the controller's memory retention circuit satisfied.

  • 286 and 386 compatibility: Both models share the same backup power rail, connector footprint, and SRAM retention voltage threshold. One cell covers both platforms without any modification to the battery compartment or wiring.
  • Bench tested on actual hardware: We ran this cell on a 286 controller under float charge and verified the BMS accepted the cell without triggering a battery fault alarm. Open-circuit voltage held within the retention window throughout the test cycle.
  • Hot-swap procedure — mandatory: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is powered off erases SRAM — program memory is lost and a full reload from the programming device is required.

PLC losing program memory after battery swap

SRAM on the 286 and 386 has no capacitor backup — it depends entirely on live battery voltage the moment the old cell is removed. If the swap happens with the PLC powered off, SRAM collapses immediately and the stored program is gone. The controller will boot to a fault or blank state on next power-up. Reconnect your programming device, reload the last saved project, and confirm the RTC is set correctly before returning the unit to service.

Battery alarm not clearing after a confirmed good installation

The 286 and 386 do not automatically clear the battery alarm once a new cell is fitted. The alarm flag is latched in the controller's status register and requires a manual reset through the programming software. Open the diagnostics or system status screen in your programming environment and clear the battery fault bit directly. If the alarm returns within hours, measure cell voltage at the connector — it should read above 3.5V under no-load conditions.

Compatible Models

286 386

Technical Specifications

Voltage3.6V
Amp Hours2700mAh
Capacity2700mAh
Rate9.72Wh
Net Weight28.5g /1.01 oz
Gross Weight53.5g /1.89 oz
Approximate Weight53.5g /1.89 oz
Dimension 60.55 x 18.50 x 18.35mm

Product Highlights

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

Frequently Asked Questions

My IDS 286 powered down during the battery swap and now it won't run — what happened?

Removing the backup cell while the PLC is de-energised collapses SRAM instantly — the stored program and any retained data are gone. The controller has nothing to execute on power-up, so it faults or sits idle. Connect your programming device, reload the last saved project file, and reset the RTC to the correct time and date. From this point on, always swap the cell with the PLC powered on and in RUN mode.

The new cell I just fitted reads 3.3V on a multimeter — is it dead on arrival?

Li-MnO2 cells ship at a storage voltage deliberately kept below the 3.6V nominal to slow self-discharge in transit. That 3.3V reading is normal. Once the cell is seated in the PLC and the controller is running, the float charge circuit brings it up to full voltage within a few hours. Re-check voltage at the battery connector after four hours of powered operation — it should read 3.5V or above.

The clock on my IDS 386 is showing the wrong date every time I cycle power — what causes that?

The real-time clock on the 386 loses sync any time battery voltage drops below the SRAM retention threshold, including during a power-off swap. The RTC does not resynchronise automatically — it holds whatever value was in the register at the point of failure, or resets to a default epoch. Open the system clock settings in your programming software and set the correct date and time manually. If the clock drifts again within days, the new cell may not be making solid contact — reseat it and confirm voltage at the connector reads above 3.5V.

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