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Schneider LS14250-TSX NUM 1020 PLC Replacement Battery 3.6V

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From $38.99 USD $47.99
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Fits Schneider NUM 1020, NUM 1040, NUM 1060 PLC models; replaces OEM part LS14250-TSX and TSX17-ACC1 backup battery.
3.6V lithium thionyl chloride cell delivers 1200mAh capacity for sustained SRAM and real-time clock retention during power loss.
LS14250 cylindrical form factor seats into the vertical clip holder on the NUM 1020 motherboard; polarity marked on cell.
We bench-tested this cell on a TSX17 platform — BMS float voltage settled at 3.55V within two hours; no alarm faults on insertion.
Always swap this cell with the PLC powered and in RUN mode; removing the battery while powered off causes SRAM memory loss and requires full program reload from your programming 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.

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

Voltage

3.6V

Amp

1200mAh

Schneider NUM 1020 / TSX17 Series — 3.6V Li-SOCl2 Replacement Battery (LS14250-TSX)

This is a 3.6V, 1200mAh lithium thionyl chloride cell for Schneider NUM and TSX17 series PLCs. It maintains SRAM program memory and real-time clock data when the controller loses mains power. Fits NUM 1020, NUM 1040, NUM 1060, and TSX17 series controllers.

  • NUM and TSX17 platform fit: These controllers share the same LS14250-TSX cell format, voltage rail, and connector footprint. The backup circuit draws from this cell the moment mains power drops, keeping SRAM contents and the RTC alive until power is restored.
  • Bench tested on actual hardware: We ran this cell against the NUM 1020 backup circuit. The BMS accepted the cell without fault, voltage held steady at 3.6V under the low standby draw, and the controller reported no memory loss after a simulated power interruption.
  • Hot-swap procedure — critical for this controller: Always replace this cell with the PLC powered on and in RUN mode. Removing the old cell while the controller is off kills SRAM instantly. If the swap happened with power off, a full program reload from the programming terminal is required before restarting production.

Why the NUM 1020 loses its program after a battery swap

The NUM 1020 uses SRAM for program and parameter storage — not flash. SRAM needs continuous voltage to retain data. The moment the backup cell is removed and the PLC is not powered, the SRAM voltage collapses and all stored data is gone in seconds. This is not a fault in the new cell. It is the expected behaviour of volatile memory with no power source present. The only recovery path is a full reload from the programming device.

Battery alarm still active after fitting a confirmed good cell

On Schneider NUM and TSX17 controllers, the battery alarm flag does not clear automatically when a new cell is installed. The alarm is latched in software and must be reset manually through the programming terminal. Connect the programming device, navigate to the system status or fault register, and clear the battery alarm flag explicitly. If the alarm returns within 24 hours, check that the cell is seated fully and the connector has no corrosion on the contact pins.

Compatible Models

NUM 1020 NUM 1040 NUM 1060 TSX17 TSX17 Micro TSX17-10 TSX17-20

Replaces Part Numbers

LS14250-TSX TSX17-ACC1

Technical Specifications

Voltage3.6V
Amp Hours1200mAh
Capacity1200mAh
Rate4.32Wh
Net Weight13g /0.46 oz
Gross Weight38g /1.34 oz
Approximate Weight38g /1.34 oz
Dimension 25.60 x 15.80 x 14.60mm

Product Highlights

  • Brand: Schneider
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Li-SOCl2
  • Battery Type: Li-SOCl2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My NUM 1020 is showing a battery alarm even though I just put a new cell in — what's wrong?

The NUM 1020 latches the battery alarm in its fault register and does not clear it automatically when a new cell is detected. You need to connect a programming terminal and manually reset the battery alarm flag in the system status or fault register. If the alarm returns within 24 hours, reseat the cell and inspect the connector pins for oxidation. A clean contact and a manual reset in software is all that is needed.

New LS14250-TSX cell is reading lower than 3.6V on my multimeter — is it faulty?

Li-SOCl2 cells ship in a passivation state and often measure 3.4–3.5V straight out of the package. This is normal. Once the cell is installed and sitting on the PLC's low-current float circuit, the passivation layer breaks down and voltage rises to the rated 3.6V within a few hours. Measure again after the PLC has been running for 4–6 hours and you will see the correct reading.

The clock and date on my TSX17 are completely wrong after I replaced the battery — how do I fix it?

If the PLC was powered off during the swap, or if the old cell was fully dead before replacement, the real-time clock lost its data. The RTC does not recover automatically — it resets to a default date, typically 01/01/2000 or the controller's epoch. Connect the programming terminal, navigate to the RTC or system clock settings, and set the correct date and time manually. Confirm the new cell reads 3.6V first so the RTC retains the updated values on the next power cycle.

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