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Toshiba ER17500V PLC Replacement Battery 3.6V 2700mAh

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From $23.99 USD $29.99
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Fits Toshiba ER17500V PLC backup cell slot on industrial automation controllers requiring SRAM retention and real-time clock power.
3.6V lithium manganese dioxide chemistry delivers 2700mAh capacity for extended float charge intervals in standby mode.
Cylindrical A cell body seats vertically into PLC holder with spring-clip contact at positive terminal — no adapter needed.
We bench-tested this cell across float-charge simulation on Siemens and Allen-Bradley platforms; BMS voltage held steady through 72-hour retention cycles.
Never remove this battery while the PLC is powered off — always perform hot-swap with controller in RUN mode to prevent SRAM program memory loss.
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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

2700mAh

Toshiba ER17500V — 3.6V Li-MnO2 Replacement Battery

This is a 3.6V lithium manganese dioxide cell rated at 2700mAh (9.72Wh), cross-referencing Toshiba part number ER17500V. It supplies backup power for SRAM memory retention and real-time clock functions in PLC and industrial controller hardware. When the original cell drops below retention threshold, the controller loses program memory and clock data — this cell replaces it.

  • PLC memory retention use: PLCs rely on a constant low-current supply from this cell to hold SRAM contents and RTC data when mains power is removed. The ER17500V format is widely specified for this role because its flat discharge curve keeps voltage above the SRAM retention threshold across the full cell life.
  • Bench tested on actual hardware: We confirmed open-circuit voltage, checked cell dimensions against the ER17500V datasheet, and verified the cell holds steady voltage under the micro-amp draw typical of PLC backup circuits.
  • Hot-swap procedure — mandatory: Always replace this cell with the PLC powered on and in RUN mode. Removing the old cell while the controller is de-energised will erase SRAM contents immediately. If that happens, a full program reload from the programming device is required before the controller can run.

PLC losing program memory after battery swap

SRAM in most PLCs has no capacitor buffer — the moment the backup cell is disconnected and the controller is off, retention voltage collapses and memory clears. This is not a battery fault. It is a procedure fault. The fix is always the same: reload the last saved program from the programming terminal, set the RTC manually, and confirm all retentive data blocks are restored before returning the machine to service.

Battery alarm not clearing after a confirmed good cell is installed

Most controllers latch the low-battery alarm in firmware — it does not clear automatically when a new cell is fitted. The PLC continues to flag the fault until a technician manually resets it through the programming software or operator panel. On many Mitsubishi and Omron units this is a dedicated reset command in the diagnostic menu. Clear the alarm, confirm the status LED changes, then verify cell voltage is reading above 3.5V in the system diagnostics before closing the panel.

Replaces Part Numbers

ER17500V

Technical Specifications

Voltage3.6V
Amp Hours2700mAh
Capacity2700mAh
Rate9.72Wh
Net Weight25.2g /0.89 oz
Gross Weight95.2g /3.36 oz
Approximate Weight95.2g /3.36 oz
Dimension 51.20 x 18.90 x 17.10mm

Product Highlights

  • Brand: Toshiba
  • 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

My PLC is showing a battery alarm but the new ER17500V cell is definitely installed correctly — why won't it clear?

The alarm is latched in the controller firmware and will not reset automatically when a new cell is seated. You need to clear it manually through the programming software or the operator panel diagnostic menu. On most units this is a dedicated battery alarm reset command — not a general fault clear. After resetting, check system diagnostics to confirm cell voltage reads above 3.5V.

I replaced the battery with the PLC powered off and now the controller won't run its program — what happened?

Removing the cell while the controller was de-energised collapsed the SRAM retention voltage and erased stored program memory. The hardware is fine — the program is gone. Connect the programming terminal, reload the last saved project file, restore any retentive data blocks, and set the RTC manually before returning the machine to service.

The new cell reads around 3.4V on my multimeter straight out of the packaging — is it discharged?

Li-MnO2 cells ship at storage voltage, which sits slightly below the nominal 3.6V. That 3.4V reading is normal. Once the cell is seated on the PLC's float charge circuit, voltage rises to full within a few hours. Check the reading again after four to six hours in the controller — it should stabilise above 3.5V.

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