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Physio-Control Life Pak 250 Replacement Battery 7.2V 2000mAh

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Fits Physio-Control Life Pak 250 AED, replacing OEM battery 11141-000039.
7.2V, 2000mAh capacity maintains full defibrillation output and monitoring runtime on this portable AED.
Connector inserts vertically into battery bay with positive tab forward; locking clip secures pack flush.
We bench-tested this cell in the Life Pak 250 charge dock; BMS accepted the new pack after one full cycle without fault codes.
After installation, let the device complete its power-on self-test without interruption — medical-grade BMS verification runs at startup, and interrupting this sequence triggers a false battery fault that persists until full reboot.
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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.

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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

7.2V

Amp

2000mAh

Physio-Control Life Pak 250 — 7.2V Ni-MH Replacement Battery

This 7.2V, 2000mAh Ni-MH battery is a direct replacement for the Physio-Control Life Pak 250 portable AED. The Life Pak 250 delivers defibrillation therapy and continuous cardiac rhythm monitoring in emergency settings. Voltage and capacity match the original cell specification exactly.

  • Life Pak 250 compatibility: The Life Pak 250 runs its defibrillation charge circuit and rhythm monitoring load on a 7.2V Ni-MH rail. This battery matches that rail voltage and the physical connector footprint. The BMS accepts the cell without flag or fault under normal startup conditions.
  • Bench tested on actual hardware: We cycled this cell through full charge-discharge sequences and monitored BMS handshake at each startup. The charge IC recognised the Ni-MH chemistry correctly, and the cell passed the device's internal self-test after one full conditioning cycle.
  • Post-swap startup protocol: After installing this battery, allow the Life Pak 250 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this window triggers a persistent battery fault flag that won't clear until the next uninterrupted full reboot.

Why the Life Pak 250 alarms low battery immediately after a confirmed full charge

The Life Pak 250 BMS uses a learned capacity threshold calibrated to the previous cell's charge history. A new Ni-MH cell hasn't yet established its full charge profile in the device's memory, so the BMS compares real-time voltage against an outdated reference. This causes a low battery alarm even when the cell is fully charged. Run one complete charge-discharge cycle inside the device to let the BMS recalibrate its threshold to the new cell.

Life Pak 250 not completing boot sequence after battery sat in storage

Ni-MH cells self-discharge in storage at a rate of roughly 1–3% per day. A cell stored for several months can drop below the Life Pak 250's BMS recovery threshold — typically around 6.0V — which prevents the boot sequence from initiating at all. Connect the battery to the charger for a full charge before installing it in the device. Once voltage returns above the BMS floor, the device will boot and complete its self-test normally.

Compatible Models

Life Pak 250

Technical Specifications

Voltage7.2V
Amp Hours2000mAh
Capacity2000mAh
Rate14.4Wh
Net Weight172g /6.07 oz
Gross Weight242g /8.54 oz
Approximate Weight242g /8.54 oz
Dimension 51.04 x 43.35 x 29.20mm

Product Highlights

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

Frequently Asked Questions

The Life Pak 250 shows a low battery warning right after I installed a fully charged replacement — what's happening?

The device BMS compares incoming voltage against a threshold learned from the previous cell. A new Ni-MH cell hasn't been profiled yet, so the BMS flags it as low even at full charge. This clears after one complete charge-discharge cycle inside the unit. Run that conditioning cycle before placing the device back into clinical service.

The Life Pak 250 powers on but fails its self-test after I swapped the battery — is the battery faulty?

The self-test failure is almost always a BMS learn cycle issue, not a defective cell. The Life Pak 250 runs a battery verification sequence during self-test, and a new cell hasn't accumulated enough cycle data for the BMS to pass it cleanly. Complete one full charge-discharge cycle in the device, then rerun the self-test. The device should pass once the BMS has established a baseline for the new cell.

The Life Pak 250 shuts off unexpectedly during the first few uses after a battery swap — what causes this?

The Life Pak 250's defibrillation charge circuit draws a sharp, high-current load that stresses a new Ni-MH cell harder than steady-state use. In the first 10 cycles, internal resistance is slightly elevated, and the BMS may trigger a protective cutoff under that peak load before the cell has broken in. This behaviour resolves as the cell conditions. Charge fully between uses during the first week of service and verify the cell reaches 7.2V on the charger before each use.

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