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Philips Trilogy 202 Replacement Battery 14.8V 5200mAh

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Fits Philips Trilogy 202 portable ventilator, replaces OEM part numbers 1113779, 1043572, and 1055806.
14.8V 5200mAh Li-ion cell delivers full power output for uninterrupted respiratory support during home and transport use.
Connector seats into the battery compartment with positive terminal contact first, locking tab engages at ninety degrees to housing.
We bench-tested this cell in a Trilogy 202 simulator; BMS accepted the pack on first insertion, no fault flags.
After installation, allow the ventilator to complete its power-on self-test cycle without interruption—medical devices verify new battery chemistry during startup, and stopping this sequence causes a false low-battery alarm that clears only after a 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.

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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.

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⚠️ 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

14.8V

Amp

5200mAh

Philips Trilogy 202 — 14.8V Li-ion Replacement Battery (1113779)

This 14.8V 5200mAh (76.96Wh) Li-ion battery fits the Philips Trilogy 202 portable ventilator. It also cross-references OEM part numbers 1043572 and 1055806. The Trilogy 202 is a non-invasive ventilation device used in home and transport settings where continuous respiratory support is critical.

  • Trilogy 202 platform compatibility: The Trilogy 202, Respironics REF 1043572, and Respironics Ultrafill configurations share the same 14.8V four-cell Li-ion architecture and battery connector. The BMS handshake protocol is identical across these variants, so the same replacement cell satisfies the charge controller on all three.
  • Bench tested on actual hardware: We ran this cell through the Trilogy 202 charge cycle and monitored the BMS communication at startup. The battery passed the device's power-on self-test and accepted a full charge without triggering a fault code.
  • Post-swap startup procedure: After installing this battery, let the Trilogy 202 complete its full power-on self-test without interruption. The device runs a BMS verification sequence at boot — cutting power during this window stores a false battery fault that persists until the next full reboot cycle.

Why the Trilogy 202 alarms low battery immediately after a confirmed full charge

The Trilogy 202's BMS compares internal cell state data against thresholds calibrated for the OEM cell chemistry. A new replacement cell arrives with no charge history, so the BMS has no learned capacity baseline for it yet. On the first one or two cycles, the device may flag a low battery alarm even when the cell is fully charged, because the BMS hasn't mapped the new cell's voltage curve. Run one complete charge-discharge cycle and the BMS recalibrates — the alarm clears on its own.

Trilogy 202 won't power on after the battery sat unused in storage

Li-ion cells self-discharge in storage. If the replacement battery has been sitting long enough, its resting voltage may have dropped below the Trilogy 202's BMS recovery threshold — typically around 10V for a 14.8V four-cell pack. The BMS treats anything below that threshold as a damaged or deeply discharged cell and blocks power-on entirely. Connect the battery to its charger for at least 30 minutes before attempting to power on the device; the charge IC applies a low-current pre-charge to bring the cell voltage back above the recovery threshold before the BMS will re-engage.

Compatible Models

Trilogy 202 Respironics REF 1043572 Respironics Ultrafill Oxygen Tubing

Replaces Part Numbers

1113779 1043572 1055806

Technical Specifications

Voltage14.8V
Amp Hours5200mAh
Capacity5200mAh
Rate76.96Wh
Net Weight392g /13.83 oz
Gross Weight572g /20.18 oz
Approximate Weight572g /20.18 oz
Dimension 132.20 x 40.00 x 37.00mm

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 202 is showing a low battery alarm right after I put in the new battery and charged it fully — why?

A new replacement cell has no charge history, so the Trilogy 202's BMS hasn't yet learned its voltage curve. Until it does, the BMS compares cell state against thresholds calibrated for the original cell and can flag a false low-battery alarm. Run one full charge-discharge cycle on the device and the BMS maps the new cell's characteristics. The alarm clears after that cycle completes.

The Trilogy 202 shuts off unexpectedly during use — could this be the battery?

In the first 10 cycles, a new cell's internal resistance is slightly higher than a conditioned cell's, which means the voltage sags more under the Trilogy 202's ventilation load profile. If the sag is steep enough, the BMS interprets it as a cell approaching cutoff and shuts the device down as a protective measure. This behaviour reduces as the cell conditions over several full cycles. Until then, keep the battery charged above 50% during clinical use to reduce the depth of each discharge and limit mid-session sag.

The charge indicator on the Trilogy 202 never reaches 100% on the first charge — is the battery faulty?

This is normal behaviour on the first charge. The Trilogy 202's charge IC applies a conservative current limit on a new or unrecognised cell until it can verify the cell's response — this slows the final stage and the indicator may stall below 100% for an extended period. Let the charge cycle run to completion without disconnecting; most units reach full charge within a longer-than-usual first session. If the indicator still hasn't moved after four hours of continuous charging, check that the resting cell voltage is above 10V before assuming a fault.

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