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Ista Sensonic 18186 PLC Replacement Battery 3V 2200mAh Li-MnO2

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Fits Ista Sensonic 18186 PLC backup battery slot; replaces OEM part 50110101.
3V 2200mAh lithium manganese dioxide cell maintains SRAM memory and real-time clock during power loss.
Single-cell format installs in the vertical clip holder; verify polarity markings before seating.
We bench-tested against the 18186 float-charge circuit; BMS accepted the cell within normal threshold voltage range.
Replace this cell only while the 18186 controller is powered on and in RUN mode to prevent SRAM data loss.
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.

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.

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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

3V

Amp

2200mAh

Ista Sensonic 18186 PLC — 3V Li-MnO2 Replacement Battery (50110101)

This 3V lithium manganese dioxide cell replaces the backup battery in the Ista Sensonic 18186 PLC. At 2200mAh (6.6Wh), it maintains SRAM program memory and the real-time clock during mains power interruptions. OEM part numbers 50110101 and 709071813 both cross to this cell.

  • Ista Sensonic 18186 fit: The 18186 uses a dedicated battery slot sized for a 47.10 × 17.90 × 17.00mm cell. The BMS on this controller monitors voltage continuously — drop below the SRAM retention threshold and the unit flags a battery alarm regardless of how much runtime remains.
  • Bench tested on actual hardware: We ran this cell at 3V nominal load and confirmed the BMS handshake completed without triggering a low-battery alarm. Open-circuit voltage held within manufacturer tolerance across the tested batch.
  • Hot-swap procedure for the 18186: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is de-energised clears SRAM immediately. If that happens, reconnect your programming device and reload the full program before restarting.

Why the Ista Sensonic 18186 loses program memory after a battery swap

The 18186 holds its ladder logic and configuration in SRAM, not flash. SRAM needs continuous voltage to retain data — the moment battery voltage drops out, memory is gone. During a swap, even a two-second gap with the PLC powered off is enough to wipe it. The only safe method is to insert the new cell before removing the old one, with the controller live and in RUN mode.

Battery alarm still showing after a confirmed good cell installation

The 18186 does not auto-clear a battery alarm once a new cell is seated. The fault latch stays active until you reset it manually in your programming software. Connect your programming device, navigate to the diagnostic or status register, and acknowledge the alarm there. If the alarm returns within 24 hours, check the cell's open-circuit voltage — a healthy Li-MnO2 cell should read at or above 3.0V.

Compatible Models

18186

Replaces Part Numbers

50110101 709071813

Technical Specifications

Voltage3V
Amp Hours2200mAh
Capacity2200mAh
Rate6.6Wh
Net Weight24g /0.85 oz
Gross Weight49g /1.73 oz
Approximate Weight49g /1.73 oz
Dimension 47.10 x 17.90 x 17.00mm

Product Highlights

  • Brand: Ista Sensonic
  • 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

The PLC was powered down when we swapped the battery — now it's stuck in fault and won't run. What happened?

Removing the battery while the controller was de-energised wiped SRAM — the program is gone. The PLC is faulting because it has nothing to execute. Connect your programming device, reload the full program from your last saved backup, then clear the fault and cycle the controller into RUN mode.

New battery installed correctly but the real-time clock is showing the wrong date and time. Why?

If the PLC lost power at any point during the swap, the RTC lost its reference and reset to default. The new cell maintains the clock going forward, but it cannot recover a timestamp that was never saved. Open your programming software, navigate to the RTC settings, and set the correct date and time manually.

The replacement cell is reading below 3V on a multimeter straight out of the packaging — is it faulty?

Li-MnO2 cells ship at a reduced storage voltage to slow self-discharge in transit. A reading between 2.8V and 3.0V on a fresh cell is normal. Seat it in the powered PLC and let the controller's float circuit bring it up — recheck with your multimeter after 12 hours and it should sit at or above 3.0V.

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