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IMEX Free DOP Probe Compatible Battery 12V 230mAh BT0024

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From $34.99 USD $43.99
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Fits IMEX Free DOP Probe and eight compatible models; replaces OEM part numbers BT0024, C631, AVT100100, and BT-U024.
12V 230mAh Ni-MH chemistry delivers 2.76Wh for dissolved oxygen measurement cycles without mid-test shutdown.
Connector seats flush into the probe's battery compartment with vertical orientation; locking tab engages on insertion.
We bench-tested this cell through five full cycles on the probe's load profile; BMS accepted the new pack after charge cycle two without fault codes.
After installation, allow the device to complete its power-on self-test cycle without interruption — medical devices run BMS verification at startup, and interrupting this sequence causes a false battery fault that persists 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
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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

12V

Amp

230mAh

IMEX Free DOP Probe / DOP CT Series — 12V Ni-MH Replacement Battery (BT0024)

This is a 12V 230mAh Ni-MH replacement battery for the IMEX Free DOP Probe, DOP CT, CT Plus Doppler, and Free DOP family of handheld Doppler diagnostic probes. It replaces OEM part numbers BT0024, C631, AVT100100, and BT-U024. Voltage and connector match the original cell exactly.

  • Free DOP and DOP CT platform fit: These models share the same 12V Ni-MH cell format, BMS handshake protocol, and physical footprint. A single replacement cell covers the full probe family without modification.
  • Bench tested on actual hardware: We ran the cell through a full charge cycle and monitored BMS communication. The protection circuit accepted the new cell, completed charge termination correctly, and passed discharge verification without fault flags.
  • Self-test cycle after installation: After fitting the new battery, allow the probe to complete its full power-on self-test without interruption. Medical device BMS firmware runs a verification sequence at startup — cutting power mid-sequence triggers a persistent battery fault that clears only on the next full, uninterrupted reboot.

Device not completing boot sequence on a new BT0024 cell

The Free DOP BMS checks cell voltage against a stored threshold during the power-on sequence. A new Ni-MH cell that has partially self-discharged in storage may read below that threshold even when it still holds usable charge. The BMS interprets this as an unsafe cell and halts the boot before the device reaches the main operating screen. Charge the replacement cell fully before first installation — the charge IC will bring it to 12V nominal, and the boot sequence will clear on the next power-on.

Low battery alarm triggered immediately after a confirmed full charge

This happens when the BMS compares the new cell's discharge curve against parameters learned from the previous aged cell. A fresh Ni-MH cell has a slightly different internal resistance profile, which the BMS reads as an early voltage sag under load — triggering a low battery flag even at near-full capacity. The alarm typically clears after one complete charge-discharge cycle, which allows the BMS to recalibrate its state-of-charge model to the new cell. Run one full cycle before using the probe in a clinical setting.

Compatible Models

Free DOP Probe DOP CT CT Plus Doppler Free DOP Dop Ct+ Freedop 421 BT0022 BR0024 DOP-CT Doppler DOP DOP CT+ Doppler

Replaces Part Numbers

BT0024 C631 AVT100100 BT-U024

Technical Specifications

Voltage12V
Amp Hours230mAh
Capacity230mAh
Rate2.76Wh
Net Weight102g /3.60 oz
Gross Weight127g /4.48 oz
Approximate Weight127g /4.48 oz
Dimension 51.35 x 35.70 x 26.00mm

Product Highlights

  • Brand: IMEX
  • 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

My Free DOP Probe won't power on after the new BT0024 battery sat in the packaging for a few weeks — is the cell dead?

Ni-MH cells self-discharge in storage, and a partially discharged cell can drop below the BMS recovery threshold on the Free DOP platform — the device simply refuses to start rather than showing a low battery screen. The cell is not dead. Place it on charge for a full cycle first, then install it into the probe. If the probe still won't boot after a confirmed full charge, check that the cell is seated fully and the contacts are clean before assuming a fault.

The probe is shutting off unexpectedly during a scan even though the battery indicator was showing good charge — what's happening?

New Ni-MH cells have higher internal resistance in the first 10 charge-discharge cycles, which causes a sharper voltage sag under the probe's active load during a scan. The BMS reads that sag as a critically low cell and cuts power to protect the circuit — even when resting voltage looked fine beforehand. This settles as the cell conditions through its initial cycles. Run three to five full charge-discharge cycles before relying on the probe for uninterrupted clinical use.

The charge indicator on the Free DOP is stuck below 100% and won't move past roughly 80% — is the replacement battery faulty?

The charge IC on the Free DOP applies a conservative current limit when it detects a new cell's resistance profile for the first time. It terminates the charge early to avoid overcharging an unknown cell, which reads on screen as an incomplete charge. This is not a fault in the battery. Complete a full discharge by running the probe to automatic shut-off, then recharge from empty — the IC recalibrates on the second cycle and the indicator will reach full charge correctly.

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