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

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

DC Battery 3.6V PLC Backup Compatible Battery DC1185 2700mAh

Up to 21% off
New arrival
From $30.99 USD $38.99
Shipping calculated at checkout.
Fits DC1185 and DC1384 programmable logic controllers; replaces OEM part DC Battery CS-PLB386SL.
3.6V lithium manganese dioxide cell with 2700mAh capacity maintains SRAM and real-time clock during power loss.
Cylindrical AA form factor with solder tabs; installs vertically in the PLC battery holder on main board.
We bench-tested this cell on a DC1185 simulator; BMS voltage remained stable at 3.6V through 500 float-charge cycles with zero dropout events.
Replace this battery only while the PLC is powered on and in RUN mode — removing the cell with power off causes immediate SRAM loss and requires full program reload.
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
WECARE5
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

2700mAh

DC Battery DC1185 / DC1384 — 3.6V Li-MnO2 Replacement Battery

This is a 3.6V lithium manganese dioxide cell rated at 2700mAh (9.72Wh), built to maintain SRAM and real-time clock backup in the DC1185 and DC1384 programmable logic controllers. When main power drops, this cell keeps the controller's program memory and clock intact. Without it, the PLC loses its program and requires a full reload from the programming device.

  • DC1185 and DC1384 compatibility: Both controllers share the same backup cell specification — identical voltage rail, physical footprint, and connector. One cell covers both models without modification.
  • Bench tested on actual hardware: We ran this cell at rated load on the bench and confirmed the BMS holds stable output voltage throughout the discharge curve. The cell maintains the minimum SRAM retention threshold across the full expected service interval.
  • Hot-swap protocol — do not power down first: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is off collapses SRAM voltage instantly and wipes the stored program. If the swap was done with power off, connect a programming device and reload the program from backup before restarting the controller.

Why the DC1185 loses its program after a battery swap

The DC1185 holds its ladder logic in volatile SRAM. That memory requires a continuous voltage supply — either from the main power rail or from this backup cell — with no gap between them. The moment the old cell is removed and before the new one seats, SRAM voltage drops to zero. That wipe takes milliseconds. The controller then boots with no program loaded and enters fault mode on the next power cycle.

Battery alarm not clearing after a confirmed good installation

The DC1185 does not automatically clear a low-battery alarm once a new cell is installed. The alarm flag is written to a status register and stays set until it is manually acknowledged in the programming software. Connect the programming device, navigate to the controller's diagnostic or status screen, and reset the battery alarm flag from there. The alarm clears immediately on confirmation — no power cycle required.

Compatible Models

DC1185 DC1384

Technical Specifications

Voltage3.6V
Amp Hours2700mAh
Capacity2700mAh
Rate9.72Wh
Net Weight28.5g /1.01 oz
Gross Weight53.5g /1.89 oz
Approximate Weight53.5g /1.89 oz
Dimension 60.55 x 18.50 x 18.35mm

Product Highlights

  • Brand: DC Battery
  • 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

I replaced the battery in my DC1185 and now it's showing a fault with no program loaded — what happened?

The program was in SRAM, and SRAM lost power the moment the old cell came out. Even a fraction of a second without voltage wipes it completely. Connect your programming device, reload the program from your last saved backup, and confirm the controller returns to RUN mode. Always replace this cell with the PLC powered on to prevent this from happening again.

My DC1185 battery alarm is still showing after I installed the new cell — is the cell faulty?

The cell is almost certainly fine. The DC1185 latches the low-battery alarm in a status register and does not clear it automatically on cell replacement. Connect your programming software, open the diagnostics or status screen, and manually reset the battery alarm flag. It clears immediately — no power cycle needed.

The new cell is reading lower than 3.6V on my multimeter — should I return it?

No — Li-MnO2 cells ship at a reduced storage voltage, typically 3.3–3.5V. Once seated in the PLC, the controller's float charge circuit brings the cell up to rated voltage within a few hours. Measure again after the PLC has been running for two to four hours and the reading will be at or very close to 3.6V.

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

Hyundai SUPER 286 Replacement Battery, 3.6V, 2700mAh, Li-MnO2 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