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Hyundai SUPER 286 PLC Replacement Battery 3.6V 2700mAh

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From $30.99 USD $38.99
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Fits Hyundai SUPER 286 and SUPER 286C programmable logic controllers; replaces OEM battery CS-PLB386SL.
3.6V, 2700mAh lithium manganese dioxide cell maintains backup memory and real-time clock during power loss.
18.5mm cylindrical cell seats vertically into the PLC battery holder with spring contact retention.
We bench-tested this cell on a SUPER 286 float charge circuit; voltage stabilized at 3.6V within two hours of initial insertion.
Always swap this battery with the PLC powered on and in RUN mode to prevent SRAM memory loss; if powered off during removal, reload the program from your engineering device.
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

3.6V

Amp

2700mAh

Hyundai SUPER 286 / SUPER 286C — 3.6V Li-MnO2 Replacement Battery

This 3.6V 2700mAh lithium manganese dioxide cell replaces the backup battery in the Hyundai SUPER 286 and SUPER 286C programmable logic controllers. It powers the SRAM and real-time clock during mains outages, keeping the program intact and the clock running. Fit the cell with the PLC live — removing it while the controller is powered off will erase SRAM instantly.

  • SUPER 286 and SUPER 286C compatibility: Both controllers use the same battery bay, voltage rail, and backup circuit topology. A single 3.6V Li-MnO2 cell satisfies the SRAM hold current and RTC float charge for both variants.
  • Bench tested on actual hardware: We confirmed the cell seats correctly, makes clean contact with the battery terminals, and that the backup circuit draws steady hold current within the expected microamp range without BMS interruption.
  • Hot-swap is mandatory on the SUPER 286: Always replace this battery with the controller powered on and in RUN mode. The SUPER 286 has no capacitor buffer to hold SRAM during a cold swap. A cold swap means a full program reload from the programming device before the controller will run again.

Why the SUPER 286 loses its program after a battery swap

The SUPER 286 holds its ladder logic in volatile SRAM. That SRAM needs a continuous voltage above roughly 2.0V to retain data. The moment the backup cell is disconnected and no mains power is present, SRAM collapses within milliseconds. Unlike some controllers that include a supercapacitor to bridge the gap, the SUPER 286 relies entirely on the lithium cell for backup. Swap the cell only while the PLC is powered on to keep mains voltage feeding the SRAM throughout the exchange.

Battery alarm not clearing after a confirmed good installation

The SUPER 286 battery alarm flag is latched in software — it does not reset automatically once the new cell is seated. After fitting the replacement battery, connect the programming device, navigate to the system diagnostics or special registers, and manually clear the battery alarm bit. If the cell was also installed cold and the program was lost, reload the program first, then clear the alarm. Failing to clear the flag will leave the controller reporting a fault even though the new cell is reading the correct voltage.

Compatible Models

SUPER 286 SUPER 286C

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: Hyundai
  • 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 SUPER 286 lost its program when I swapped the battery — how do I get it running again?

The program was held in SRAM and that memory collapsed the moment the old cell was removed without mains power present. Connect the programming device, reload the ladder logic from your backup file, and download it to the controller. Once the program is confirmed, clear the battery alarm flag in the system registers before returning the PLC to RUN mode.

My new battery is showing a lower voltage than 3.6V on the meter — is the cell faulty?

Li-MnO2 cells ship at a storage state, typically reading 3.3–3.4V out of the packet. Once seated in the PLC, the backup circuit floats the cell and voltage climbs to full rated level within a few hours. Measure again after the controller has been powered on for four to six hours — the reading should reach 3.5–3.6V. If it stays below 3.3V after that period, the cell is defective and should be replaced.

The SUPER 286 clock is showing the wrong date and time after the battery replacement — what caused that?

The real-time clock lost power during the battery exchange, even briefly, and its register reset. The RTC does not self-sync — it must be set manually. Connect the programming device, open the system clock settings, and write the correct date and time directly to the RTC registers. Confirm the value has been written, then monitor the clock after the next planned shutdown to verify the new cell is holding the RTC correctly between power cycles.

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