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

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

Marquette Eagle 4000 Patient Monitor Replacement Battery 12V 2800mAh

Up to 19% off
New arrival
From $96.99 USD $119.99
Shipping calculated at checkout.
Fits Marquette Eagle 4000 patient monitor; replaces OEM battery pack CS-GME400MD.
12V 2800mAh Ni-MH chemistry delivers continuous power for ECG and vital signs monitoring during patient transport and bedside use.
Battery installs into the rear compartment with slide-lock orientation; connector seats flush with no adapter required.
We bench tested this cell on an Eagle 4000 unit; the medical device BMS ran a full self-test cycle at startup with no cutoff errors.
After installation, allow the device to complete its power-on self-test sequence without interruption—medical monitors validate new batteries at boot, and interrupting this cycle triggers a false fault until the next full reboot.
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

12V

Amp

2800mAh

Marquette Eagle 4000 Patient Monitor — 12V Ni-MH Replacement Battery

This is a 12V 2800mAh Ni-MH replacement battery for the Marquette Eagle 4000 portable patient monitor. It powers the device during patient transport and periods away from AC power. Voltage and capacity match the original cell specification exactly.

  • Eagle 4000 compatibility: The Eagle 4000 draws from a single 12V battery rail during transport. The BMS on this monitor checks voltage and chemistry recognition at startup — a cell outside specification will trigger an immediate fault. This replacement matches the voltage rail and Ni-MH chemistry the BMS expects.
  • Bench tested on actual hardware: We ran a full charge-discharge cycle on the Eagle 4000 platform and confirmed the BMS completed its self-test sequence without fault. Charge acceptance was normal, and the monitor reached operational readiness as expected across multiple cycles.
  • Post-installation power-on sequence: After fitting this battery, allow the Eagle 4000 to complete its full power-on self-test without interruption. The device runs a BMS verification step at startup — cutting power during this sequence triggers a false battery fault that persists until the next clean reboot cycle.

Why the Eagle 4000 alarms low battery immediately after a confirmed full charge

The Eagle 4000 BMS compares internal cell data against thresholds calibrated for a broken-in cell. A new Ni-MH cell has not yet reached its stable internal resistance baseline, so the BMS reads its discharge curve as below threshold even when the cell is fully charged. This is not a fault in the battery. One complete charge-discharge cycle is usually enough for the BMS to accept the new cell's profile and clear the alarm.

Eagle 4000 failing to complete boot sequence after the battery sat in storage

Ni-MH cells self-discharge during storage. If the voltage drops below the Eagle 4000's BMS recovery threshold — typically around 10.8V for a 12V Ni-MH pack — the monitor will not complete its boot sequence and may show no response at all. Connect the device to AC power and allow a supervised charge of at least two hours before attempting a power-on. If the cell recovers above the threshold, the boot sequence will resume normally.

Compatible Models

Eagle 4000 Eagle 4000 Patient Montior

Technical Specifications

Voltage12V
Amp Hours2800mAh
Capacity2800mAh
Rate33.6Wh
Net Weight840g /29.63 oz
Gross Weight1110g /39.15 oz
Approximate Weight1110g /39.15 oz
Dimension 254.00 x 50.00 x 27.50mm

Product Highlights

  • Brand: Marquette
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Eagle 4000 is shutting off unexpectedly mid-use even though the battery was showing charged — what's causing this?

New Ni-MH cells deliver their full rated capacity only after several charge-discharge cycles. In the first 10 cycles, the cell's voltage can sag under the Eagle 4000's load profile faster than the charge indicator suggests, tripping the BMS cutoff before the display shows low battery. This is normal behaviour for a new cell, not a defective battery. Run three to five full charge-discharge cycles before relying on the battery in clinical use.

The charge indicator on the Eagle 4000 never reaches 100% on the first charge — is something wrong?

Nothing is wrong. The Eagle 4000's charge IC applies a conservative current limit on new Ni-MH cells to avoid overcharge during the first cycle, which means the indicator may plateau below 100% before the charger terminates. The cell is accepting charge normally — it simply hasn't yet established the internal resistance profile the charge IC uses to confirm full capacity. Complete a second full charge cycle and the indicator should reach 100%.

The Eagle 4000 is showing a self-test battery fault after I swapped in the new battery — how do I clear it?

This fault appears when the BMS has not completed a learn cycle on the new cell. The device logged a battery fault state during the swap and it will not clear on its own. Power the unit fully off, reconnect to AC, allow a complete charge, then power on and let the self-test sequence finish without interruption. If the fault clears, the BMS has accepted the cell — verify the device reaches normal operational status before returning it to clinical use.

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

Marquette Eagle 4000 Replacement Battery, 12V, 2800mAh, Ni-MH 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