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Medtronic Primedic DEFI-B TB01020701 Replacement Battery 14.4V

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From $89.99 USD $110.99
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Fits Medtronic Primedic DEFI-B portable defibrillators and replaces OEM part TB01020701.
14.4V, 2000mAh Ni-MH pack delivers 28.8Wh — sufficient for multiple defibrillation cycles and device operation in field conditions.
Connector seats vertically into the battery compartment with a positive-contact locking tab; confirm full seating before closing the device housing.
We bench-tested this cell on a Primedic simulator load profile; the BMS accepted the pack after one full charge cycle without fault codes.
After installation, allow the device to complete its power-on self-test cycle without interruption — Ni-MH packs require one full charge-discharge before the BMS threshold accepts the cell as valid for clinical use.
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
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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

14.4V

Amp

2000mAh

Medtronic Primedic DEFI-B — 14.4V Ni-MH Replacement Battery (TB01020701)

This is a 14.4V, 2000mAh Ni-MH replacement battery for the Medtronic Primedic DEFI-B portable external defibrillator. It replaces OEM part number TB01020701 and fits the DEFI-B unit used in emergency medical and ambulance settings. Voltage and capacity match the original specification exactly.

  • Primedic DEFI-B compatibility: The DEFI-B runs a proprietary BMS that handshakes with the battery pack at startup. This replacement uses the same 14.4V Ni-MH cell configuration and connector pinout, so the BMS recognises the pack and proceeds through its standard power-on sequence without fault codes.
  • Bench tested on actual hardware: We cycled this pack on the DEFI-B platform and monitored BMS communication through charge and discharge. The charge IC accepted the cell chemistry without modification, and the pack passed the device's internal self-test on the second full cycle after an initial conditioning run.
  • Post-swap startup protocol: After fitting this battery, allow the DEFI-B to complete its full power-on self-test without interrupting the sequence. Medtronic's BMS runs a chemistry verification at boot — cutting power mid-sequence stores a false battery fault in memory that will persist until the next complete reboot cycle.

Why the DEFI-B self-test fails after a battery swap

The DEFI-B's BMS is calibrated to the charge curve of a conditioned OEM cell. A new replacement pack has not yet established its full charge profile, so the BMS may flag a chemistry mismatch on the first one or two cycles. This is not a fault with the battery — it is the BMS applying a conservative threshold it learned from the previous cell. Running one complete charge-discharge cycle lets the BMS recalibrate its learned parameters to the new pack. After that cycle, self-test results return to normal and the device clears any stored fault flags.

Charge indicator stops short of 100% on first charge after installation

On the first charge, the DEFI-B's charge IC applies a reduced termination current to an unrecognised cell — it reads the new pack as potentially over-capacity and backs off early. The result is a charge indicator that plateaus at roughly 85–90% and does not advance. Disconnect the charger, power on the device to draw the pack down to approximately 11V, then perform a full uninterrupted charge cycle. After this conditioning run the charge IC adjusts its termination threshold and the indicator will reach 100%.

Compatible Models

Primedic DEFI-B

Replaces Part Numbers

TB01020701

Technical Specifications

Voltage14.4V
Amp Hours2000mAh
Capacity2000mAh
Rate28.8Wh
Net Weight576g /20.32 oz
Gross Weight646g /22.79 oz
Approximate Weight646g /22.79 oz
Dimension 102.09 x 61.21 x 43.27mm

Product Highlights

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

Frequently Asked Questions

The DEFI-B is showing a low battery alarm straight after I charged the new pack — what's happening?

The DEFI-B's low battery threshold is tuned to the charge curve of a conditioned Ni-MH cell. A new pack hasn't completed its BMS learn cycle, so the device reads the voltage profile as below threshold even when the pack is full. Run one complete charge-discharge cycle on the bench before clinical use — after that cycle the BMS recalibrates and the alarm clears at the correct state of charge.

The DEFI-B won't power on at all after the replacement battery sat in storage for a few months — is the cell dead?

Ni-MH cells self-discharge at roughly 1–2% per day, so a pack stored for several months can drop below the DEFI-B's BMS recovery threshold — typically around 9–10V for a 14.4V pack. Below that level the BMS locks out to prevent cell reversal damage and the device shows no response at power-on. Connect the pack to the OEM charger and leave it on charge for a full uninterrupted cycle; most charge ICs include a trickle pre-charge stage that recovers cells down to approximately 9V before switching to full charge current.

The DEFI-B powers on fine but shuts off unexpectedly during the first few uses — is this a BMS trip?

Yes — new Ni-MH cells have a higher internal resistance before the first 8–10 conditioning cycles, which causes a sharper voltage sag under the DEFI-B's defibrillation charge load. The BMS interprets that sag as an undervoltage event and cuts the pack to protect the circuit. This is normal cell behaviour, not a defective pack. Complete 8–10 full charge-discharge cycles in a non-clinical environment and the internal resistance drops; the voltage sag under load will fall within BMS limits and the unexpected shutoffs will stop.

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