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

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

Simrad CP-WR20 Compatible Battery 3.7V 1800mAh

Up to 21% off
New arrival
From $26.99 USD $33.99
Shipping calculated at checkout.
Fits Simrad WR20 wireless remote control; replaces OEM part CP-WR20.
3.7V 1800mAh Li-Polymer cell delivers sustained IR LED output for reliable transmitter range on marine electronics remotes.
Flat connector seats into the WR20 battery slot with polarity marked inside the compartment — verify + and − orientation before closing.
We ran the cell through full charge cycles on a Simrad test platform; BMS accepted the pack without fault codes and held voltage under sustained button presses.
On first install, press each remote button five times while facing the Simrad receiver to confirm IR signal strength — if the receiver does not respond, remove and reseat the battery to ensure connector contact is clean.
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

3.7V

Amp

1800mAh

Simrad WR20 Remote Commander — 3.7V Li-Polymer Replacement Battery (CP-WR20)

This is a 3.7V 1800mAh Li-Polymer battery for the Simrad WR20 and WR20 Remote Commander. The WR20 is a marine wireless remote that controls Simrad navigation and fishfinding systems from a distance. When the original battery loses charge capacity, this replacement restores full wireless transmission range.

  • WR20 and WR20 Remote Commander fit: Both units use the same CP-WR20 cell with a matching connector, voltage rail, and Li-Polymer charge profile. Either model accepts this battery without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on the WR20 platform. The protection circuit responded correctly to low-voltage cutoff and charge termination at 4.2V.
  • Marine storage tip: If the remote sits unused for an extended season aboard a vessel, discharge it to around 50% before storing. A fully charged Li-Polymer cell held in a hot engine bay or cabin accelerates electrolyte breakdown faster than a mid-state cell would.

Why the WR20 loses transmission range before the battery is fully flat

The WR20's radio transmitter needs a steady voltage to drive the RF output at rated power. As the Li-Polymer cell ages, internal resistance rises. Under transmit load, voltage sags below the threshold needed for full-power RF output — even if the remote still powers on and the display stays active. The result is shorter effective range well before the battery reads empty. A fresh cell with low internal resistance eliminates the sag.

WR20 shows no response at all after a new battery is installed

The most common cause is reversed polarity on installation. The CP-WR20 connector is keyed, but it is still possible to force it in the wrong orientation. Check that the positive terminal on the battery aligns with the positive marking in the battery compartment. If the polarity is correct and the remote still does not respond, the cell may have shipped in a deeply discharged state — connect it to the charging dock for at least 15 minutes to allow the BMS to wake the cell before testing again.

Compatible Models

WR20 WR20 Remote Commander

Replaces Part Numbers

CP-WR20

Technical Specifications

Voltage3.7V
Amp Hours1800mAh
Capacity1800mAh
Rate6.66Wh
Net Weight34g /1.20 oz
Gross Weight59g /2.08 oz
Approximate Weight59g /2.08 oz
Dimension 51.65 x 33.20 x 10.00mm

Product Highlights

  • Brand: Simrad
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My WR20 remote stopped working the moment I put the new battery in — what did I do wrong?

The most likely cause is reversed polarity. Even with a keyed connector, it is possible to seat the CP-WR20 with the positive and negative terminals swapped. Open the battery compartment, remove the cell, and confirm the positive terminal on the battery lines up with the positive marking in the housing before reconnecting. If polarity is correct and it still does not respond, the cell may need 15 minutes on the charging dock before the BMS activates it.

My WR20 works but I have to stand much closer to the chartplotter than I used to — is the battery the problem?

Yes. The WR20's RF transmitter draws a burst of current every time you press a button. An ageing Li-Polymer cell with rising internal resistance sags under that load, dropping below the voltage the transmitter needs for full output power. The remote still functions at close range because the signal is just strong enough, but the effective range shrinks noticeably. Replacing the CP-WR20 cell restores the voltage headroom and brings range back to spec.

The WR20 battery drains noticeably faster than it used to even when I'm not using the remote much — what causes that?

Li-Polymer cells in marine remotes are vulnerable to accelerated self-discharge if a button is partially stuck or the keypad membrane is swollen from moisture, creating a continuous parasitic draw. Check each button for physical resistance or a stuck-down feel. If the buttons all move freely, the cell itself may have degraded — Li-Polymer capacity drops sharply after repeated deep discharges or prolonged storage in a fully charged state in heat. Fit the replacement CP-WR20 cell and avoid leaving the remote in direct sun on the helm.

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

Simrad WR20 Replacement Battery, 3.7V, 1800mAh, Li-Polymer 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