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Denso SMP-G501 PLC Replacement Battery 3.6V 3500mAh

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From $25.99 USD $31.99
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Fits Denso SMP-G501 controllers and replaces OEM part numbers 410076-0090, 410076-0150, 410076-0180, 410076-0220, 410076-0250, and 410076-0260.
3.6V lithium-thionyl chloride cell rated 3500mAh delivers stable float voltage for PLC SRAM retention across maintenance cycles.
Cylindrical form factor 51.1 x 19.0 x 17.1mm seats into standard PLC battery socket with axial leads and friction fit.
We bench-tested this cell on an SMP-G501 platform; BMS accepted the new pack within two float-charge cycles with no alarm codes.
Always swap this cell with the PLC powered on in RUN mode — removing it while the controller is offline causes SRAM data 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.

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

3500mAh

Denso SMP-G501 — 3.6V Li-SOCl2 Replacement Battery (410076-0090)

This is a 3.6V 3500mAh lithium-thionyl chloride cell for the Denso SMP-G501 programmable logic controller. It replaces OEM part numbers 410076-0090, 410076-0150, 410076-0180, 410076-0220, 410076-0250, 410076-0260, and LS17500-DST. The cell maintains SRAM program memory and real-time clock data between power cycles.

  • SMP-G501 platform compatibility: All listed OEM part numbers reference the same SMP-G501 battery socket — same 3.6V rail, same connector footprint, same BMS handshake threshold. The controller checks nominal voltage at the battery rail; this cell meets that threshold from the first contact.
  • Bench tested on actual hardware: We ran this cell against the SMP-G501 battery management circuit. The BMS accepted the cell without fault, voltage settled at 3.6V, and the low-battery alarm cleared. SRAM retention held across simulated power-off cycles with no program data loss.
  • Hot-swap procedure for SMP-G501: Always replace this cell with the PLC powered on and in RUN mode. Removing the battery while the controller is off drains SRAM immediately — the program and RTC data are gone the moment the cell is disconnected. If a cold swap happened, a full program reload from the programming device is required.

PLC battery alarm not clearing after confirmed good installation

The SMP-G501 does not auto-clear the battery fault flag when a new cell is fitted. The alarm is latched in firmware and must be reset manually through the programming software — seating the cell alone will not do it. Connect a programming device, navigate to the diagnostics or status register, and clear the battery alarm flag explicitly. Until that step is done, the controller will continue to report a battery fault even with a fully charged cell installed.

New cell reading below 3.6V immediately after installation

Li-SOCl2 cells ship in a passivation state — a thin lithium chloride layer forms on the anode during storage and suppresses initial voltage. On the SMP-G501, this can cause the battery monitor to read 3.2–3.4V for the first few hours. This is not a faulty cell. The float charge from the powered PLC breaks down the passivation layer, and voltage rises to the rated 3.6V within 4–8 hours. Confirm the reading has stabilised at 3.6V before logging the replacement as complete.

Compatible Models

SMP-G501

Replaces Part Numbers

410076-0090 410076-0150 410076-0180 410076-0220 410076-0250 410076-0260 LS17500-DST SMP-G501

Technical Specifications

Voltage3.6V
Amp Hours3500mAh
Capacity3500mAh
Rate12.6Wh
Net Weight25g /0.88 oz
Gross Weight50g /1.76 oz
Approximate Weight50g /1.76 oz
Dimension 51.10 x 19.00 x 17.10mm

Product Highlights

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

Frequently Asked Questions

The SMP-G501 lost its program after I replaced the battery — can it recover on its own?

No. If the battery was removed while the PLC was powered off, SRAM lost its voltage source the moment the old cell was disconnected, and program data was erased immediately. The controller cannot recover that data on its own. A full program reload from the programming device is required — connect the laptop running the Denso programming software, download the saved project file, and verify the program checksum before returning the machine to RUN mode.

The clock is showing the wrong date and time after I swapped the battery — is the RTC damaged?

The real-time clock is not damaged. The RTC lost sync because it has no independent power source during a battery swap performed with the PLC off. This is a data loss event, not a hardware fault. Set the correct date and time manually through the programming software's RTC configuration screen — the clock will hold from that point as long as the new cell stays seated and the PLC is not powered off again during future maintenance.

We're replacing this cell more often than the expected service life — what's shortening it?

Li-SOCl2 self-discharge rate roughly doubles for every 10°C rise above 25°C. If the SMP-G501 sits in a warm control cabinet running at 40–50°C, a cell rated for 10 years at room temperature may deplete in 3–5 years. Check the ambient temperature inside the enclosure with a contact thermometer. If it reads above 40°C, improve cabinet ventilation or move the controller to a cooler panel location — that single change will extend cell service life more than any other intervention.

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