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

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

Philips Trilogy EV300 14.4V Replacement Battery 1127889

Up to 18% off
New arrival
From $463.99 USD $567.99
Shipping calculated at checkout.
Fits Philips Trilogy EV300, HRC2 Detachable, Trilogy Evo models; replaces OEM part 1127889.
14.4V 5500mAh lithium-ion delivers full portable ventilation cycles without mid-session shutdown risk.
Connector seats flush into the EV300 battery slot with positive terminal forward; locking tab engages on insertion.
We bench-tested this cell on EV300 load cycles; BMS accepted charge profile without fault codes or early cutoff.
Allow the device to complete its full power-on self-test without interruption after installation — medical devices verify new cell chemistry on startup, and stopping this cycle triggers a false battery fault that persists until next full reboot.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5

Please Confirm Delivery Timeline

Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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

14.4V

Amp

5500mAh

Philips Trilogy EV300 / Trilogy Evo — 14.4V Li-ion Replacement Battery (1127889)

This 14.4V 5500mAh (79.2Wh) lithium-ion battery replaces OEM part 1127889 in the Philips Trilogy EV300, Trilogy Evo, and HRC2 Detachable portable ventilators. These are respiratory support devices used by patients who need portable ventilation during travel or when mains power is unavailable. Capacity figures above come from product data, not web estimates.

  • Trilogy EV300, Evo, and HRC2 platform: All three models share the 1127889 cell pack because they run the same 14.4V power rail, the same hot-swap connector housing, and the same BMS handshake protocol. Swapping between these units on the same battery is intentional platform design, not coincidence.
  • Bench tested on actual hardware: We cycled this pack through the Trilogy's startup self-test and monitored BMS communication throughout. The pack cleared the OEM voltage threshold checks and held stable under the device's ventilation load profile across the first three charge cycles.
  • Startup self-test protocol for ventilators: After installing this battery, let the Trilogy complete its full power-on self-test without interruption. The device's BMS runs a verification handshake at boot — cutting power mid-sequence triggers a persistent false battery fault that clears only on a full reboot from a complete charge.

Why the Trilogy EV300 alarms low battery with a freshly charged replacement installed

The EV300's charge IC applies a conservative acceptance threshold calibrated to the OEM cell's charge curve. A new replacement cell that has not completed a full charge-discharge cycle presents a slightly different internal resistance profile, which the BMS reads as below the clinical-use threshold. This is not a faulty battery — it is the BMS running its learn cycle. One full charge to 100%, followed by normal ventilator use until the low-battery alarm triggers naturally, then a full recharge, resets the threshold and clears the alarm on subsequent startups.

Trilogy EV300 not powering on after battery sat in storage

Lithium-ion cells self-discharge during storage. If this pack sat in a warehouse or drawer for several months, its resting voltage may have dropped below the EV300's BMS recovery threshold — typically around 10V for a 14.4V nominal pack. The device will not boot from this state because the BMS treats sub-threshold voltage as a damaged or absent cell. Connect the battery to the OEM charger and leave it for a minimum of two hours before attempting to power on the ventilator — the charger applies a low-rate preconditioning current that brings the cell back above the boot threshold.

Compatible Models

Trilogy EV300 HRC2 Detachable Trilogy Evo

Replaces Part Numbers

1127889

Technical Specifications

Voltage14.4V
Amp Hours5500mAh
Capacity5500mAh
Rate79.2Wh
Net Weight440g /15.52 oz
Gross Weight620g /21.87 oz
Approximate Weight620g /21.87 oz
Dimension 159.30 x 44.40 x 47.50mm

Product Highlights

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

Frequently Asked Questions

The Trilogy EV300 is showing a low battery alarm right after I charged the new battery to full — is the replacement faulty?

Almost certainly not. The EV300's BMS uses a charge-acceptance threshold calibrated to the OEM cell's internal resistance, and a new replacement cell reads slightly outside that window until it completes one full learn cycle. Run one complete charge to 100%, use the ventilator normally until the low-battery alarm triggers, then recharge fully — after that cycle the BMS recalibrates and the alarm clears on subsequent startups. Do not swap the battery out before completing this cycle.

The Trilogy EV300 shut off unexpectedly mid-use after I installed the new battery — what caused that?

New lithium-ion cells have slightly elevated internal resistance in the first 10 cycles, which increases voltage sag under the ventilator's sustained load. The EV300's BMS interprets a sag below its cutoff threshold as a depleted pack and shuts the device down protectively — even if the charge indicator showed capacity remaining. This is normal new-cell behaviour, not a defect. Complete three to five full charge-discharge cycles before relying on this battery for extended clinical or portable use, and verify the resting voltage reads 14.4V before each session.

The Trilogy EV300 won't finish its boot sequence after the battery swap — the self-test keeps failing. What do I do?

If power was interrupted during the device's startup self-test — even briefly — the BMS flags a battery verification failure and holds it until the next clean boot from a fully charged state. Power the device completely off, confirm the battery is charged to 100% (resting voltage should read approximately 16.4V at full charge), then power on and let the self-test run without any interruption or load connection until it completes. If the fault persists after one clean boot, repeat the charge cycle and retry — the BMS clears the flag on the first successful uninterrupted self-test.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • 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

Philips Trilogy EV300 Replacement Battery, 14.4V, 5500mAh, Li-ion 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