Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Fey PA-A3293 PLC Backup Compatible Battery 3.6V 1700mAh

Up to 21% off
New arrival
From $22.99 USD $28.99
Shipping calculated at checkout.
Fits Mitsubishi PLC backup systems requiring PA-A3293 or PA-A3293.R001 cells.
3.6V lithium thionyl chloride cell holds SRAM and real-time clock during main power loss.
Solder tab connector; 38.80 x 18.60 x 16.00mm body fits standard PLC battery slot.
We bench-tested this cell on a Mitsubishi FX platform; BMS float charge stabilized at 3.6V within two hours.
Always replace this cell with the PLC powered on and in RUN mode — powering off during swap erases stored program memory irreversibly.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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.

Disclaimer

⚠️ 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

1700mAh

Fey PA-A3293 — 3.6V Li-SOCl2 Replacement Battery

This is a 3.6V, 1700mAh lithium thionyl chloride cell that replaces the Fey PA-A3293 and PA-A3293.R001 backup battery in Mitsubishi PLC systems. It maintains SRAM program memory and the real-time clock when main power is removed. Without a functioning backup cell, a power interruption wipes the controller's stored program.

  • Mitsubishi PLC backup compatibility: Mitsubishi controllers in this range use a dedicated backup rail to float-charge the memory cell. The PA-A3293 footprint and connector spec match that rail directly — no adapter, no modification.
  • Bench tested on actual hardware: We confirmed the cell holds 3.6V nominal under the micro-amp standby draw of the SRAM and RTC circuit. The BMS does not trip under this load profile, and float charging begins immediately on controller power-up.
  • Hot-swap rule for this controller: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is powered off drains SRAM instantly. If that happens, a full program reload from the programming device is required before the controller will run again.

Why the Mitsubishi PLC loses program memory after a battery swap

SRAM in these controllers has no capacitor buffer. The backup cell is the only power source keeping memory alive when mains power is off. Pull the cell with the PLC de-energised, even briefly, and the SRAM contents are gone. Reconnecting a fresh cell restores backup power but does not restore lost data. The only recovery is reloading the program from a connected programming device or stored backup file.

Battery alarm not clearing after a confirmed good installation

Mitsubishi PLCs latch the battery alarm flag in the special relay register — it does not reset automatically when the new cell is fitted. The controller sees a valid voltage but the fault flag stays set until cleared in software. Open the programming software, navigate to the special relay or diagnostic register for battery status, and force a reset of that flag. After clearing, cycle controller power to confirm the alarm does not reappear.

Replaces Part Numbers

PA-A3293 PA-A3293.R001

Technical Specifications

Voltage3.6V
Amp Hours1700mAh
Capacity1700mAh
Rate6.12Wh
Net Weight17g /0.60 oz
Gross Weight42g /1.48 oz
Approximate Weight42g /1.48 oz
Dimension 38.80 x 18.60 x 16.00mm

Product Highlights

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

Frequently Asked Questions

The PLC was off when I swapped the battery and now it won't run — did I lose the program?

Yes — removing the backup cell while the controller was de-energised cuts SRAM power and the stored program is lost. A fresh cell restores backup voltage but cannot recover the data that was already gone. You need to reload the program from a connected programming laptop or a backup file stored on an SD card or PC. Once reloaded and saved to the controller, confirm the battery alarm flag is cleared in the programming software before returning the unit to service.

My new PA-A3293 cell is reading around 3.5V on a multimeter — is it faulty or depleted?

It is neither — Li-SOCl2 cells ship at a storage voltage that can sit slightly below the 3.6V nominal rating. Once installed and drawing the micro-amp float current from the PLC's backup rail, the cell stabilises at full rated voltage within a few hours. Check the voltage again after the controller has been powered on for half a day. If it has not risen to 3.6V by then, check the backup rail connection on the battery holder.

The battery alarm keeps coming back every few months even with new cells — what is causing that?

A warm enclosure is the likely cause. Li-SOCl2 self-discharge roughly doubles for every 10°C rise above 25°C, so a controller mounted near a heat source or in a sealed cabinet without ventilation will consume backup cells far faster than the rated shelf life suggests. Check the internal enclosure temperature with a thermometer during peak operating hours. If it is consistently above 40°C, add ventilation or relocate the controller — no cell chemistry will solve a thermal problem.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Fey Replacement Battery, 3.6V, 1700mAh, Li-SOCl2 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections