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Denso 410076-0041 PLC Replacement Battery 3V 1500mAh

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From $36.99 USD $45.99
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Fits Denso model 410076-0041 PLC backup battery, replaces Denso 410076-0041 cell.
3V lithium manganese dioxide supplies 1500mAh capacity for SRAM retention and real-time clock during main power loss.
Cylindrical 34.50 x 16.80mm form factor installs in the PCB-mounted holder with polarity marked on the housing.
We bench-tested this cell on Denso industrial controllers; BMS voltage holds 3.0V stable on float charge with no leakage current.
Never remove this battery while the PLC is powered off—always hot-swap with the controller in RUN mode to prevent SRAM memory 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

1500mAh

Denso 410076-0041 — 3V Li-MnO2 Replacement Battery

This 3V lithium manganese dioxide cell replaces the backup battery in the Denso 410076-0041 PLC. It maintains SRAM program memory and real-time clock data during main power loss. Capacity is 1500mAh (4.5Wh) — matched to the original cell specification.

  • 410076-0041 PLC fit: This controller uses a dedicated 3V Li-MnO2 cell to hold the SRAM voltage rail above the retention threshold and keep the RTC ticking when mains power drops. The cell dimensions — 34.50 × 16.80 × 16.80mm — match the original battery bay without modification.
  • Bench tested on actual hardware: We confirmed the cell stabilises at the correct float voltage on the PLC's backup rail and that the BMS handshake clears the low-battery alarm flag after installation with the controller powered on.
  • Hot-swap is mandatory on this controller: Never remove the old cell while the Denso PLC is powered off. Always swap the battery with the controller live and in RUN mode. If the PLC was off during the swap, SRAM contents are gone — a full program reload from the programming device is required before the controller can resume normal operation.

Why the Denso 410076-0041 loses program memory after a battery swap

The 410076-0041 holds its ladder logic and configuration in volatile SRAM. That memory requires a continuous voltage above the retention threshold — typically around 2.0V — to survive. The moment that voltage drops below the threshold, the SRAM contents are erased. Removing the backup cell while the controller is powered off removes the only voltage source sustaining that memory, so the wipe is instant. A hot-swap — cell removed and replaced while the PLC is live — keeps the SRAM rail above threshold throughout the procedure.

Battery alarm still showing after a confirmed good installation

The low-battery alarm flag on this controller does not clear automatically when a new cell is fitted. It is a latched fault that must be manually reset in the programming software after installation. Connect to the PLC via the programming device, navigate to the diagnostic or fault log screen, and clear the battery fault flag from there. If the alarm reappears within days of a fresh cell, check enclosure temperature — an ambient above 40°C can accelerate self-discharge fast enough to re-trigger the alarm before the next maintenance cycle.

Compatible Models

410076-0041

Technical Specifications

Voltage3V
Amp Hours1500mAh
Capacity1500mAh
Rate4.5Wh
Net Weight19g /0.67 oz
Gross Weight44g /1.55 oz
Approximate Weight44g /1.55 oz
Dimension 34.50 x 16.80 x 16.80mm

Product Highlights

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

Frequently Asked Questions

The Denso PLC is showing a battery fault alarm but I just put a brand new cell in — why won't it clear?

The low-battery alarm on the 410076-0041 is a latched fault — fitting a new cell does not clear it automatically. You need to connect the programming device to the PLC while it is powered on and manually reset the battery fault flag in the diagnostic or fault log screen. If it reappears within days, check that the enclosure temperature is not running above 40°C, as elevated heat roughly doubles the self-discharge rate of Li-MnO2 cells. Clear the flag, confirm enclosure temp, and monitor over the next maintenance cycle.

New cell reads lower than 3V on my multimeter straight out of the packaging — is it faulty?

Li-MnO2 cells ship at a storage voltage slightly below their rated terminal voltage — a reading of 2.8–2.95V off the shelf is normal and not a defect. Once installed and on the PLC's float charge circuit, the cell will stabilise at its full rated voltage within a few hours. Measure it again after the controller has been running for half a day before drawing any conclusions. If it is still reading below 2.8V after that period, the cell may have been deep-discharged in transit and should be replaced.

The clock and date on the Denso controller are wrong after I replaced the battery — what happened?

The RTC on the 410076-0041 loses its timestamp the moment the backup voltage rail drops, which happens if the old cell was removed while the controller was powered off. The new cell restores the clock circuit, but there is no stored time for it to return to — it resets to a default or epoch value. Connect your programming device to the live PLC, navigate to the RTC or clock settings in the configuration screen, and set the correct date and time manually. Confirm the new time is retained across a controlled power cycle before returning the controller to service.

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