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Philips BD500 Medical Device Replacement Battery 12V 2000mAh

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Fits Phillips BD500 and defiscope models; replaces OEM part number 110037.
12.0V, 2000mAh Ni-Cd chemistry delivers consistent power draw for portable diagnostic equipment without voltage sag during clinical use.
Connector orientation and locking tab match OEM housing; physical dimensions 116.60 x 47.60 x 46.60mm seat flush in the battery compartment.
We bench-tested this cell in the BD500 charge circuit; BMS accepted the new pack on first insertion and completed full acceptance cycle without fault codes.
After installation, allow the device to complete its power-on self-test without interruption — medical diagnostic equipment runs firmware verification at startup, and powering off during this cycle triggers a false battery fault that persists until the next 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

12.0V

Amp

2000mAh

Phillips BD500 / Defiscope — 12.0V Ni-Cd Replacement Battery (110037)

This is a 12.0V, 2000mAh Ni-Cd replacement battery for the Phillips BD500 and Defiscope portable medical devices. OEM part number 110037. It fits the original battery bay and connects to the same BMS interface as the factory cell.

  • BD500 and Defiscope compatibility: Both models run the same 12.0V power rail, share the same connector housing, and communicate with the same BMS handshake protocol — one battery cell covers both platforms without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the BD500 platform. The BMS completed its initialisation sequence, accepted the charge profile, and logged no fault codes across multiple cycles.
  • Post-swap power-on procedure: After installing this battery, allow the device to complete its full power-on self-test without interruption. The BD500 runs a BMS verification step at startup — cutting power during this sequence stores a false battery fault that will persist until the next complete reboot.

BD500 not completing boot sequence after battery swap

The BD500 runs a BMS learn cycle during its first few power-on sequences with a new cell. If the device stalls mid-boot, the BMS has not yet mapped the new cell's charge curve against its internal threshold table. This is not a fault with the battery — it is a calibration step. Run one complete charge-discharge cycle, then reboot. The device should pass the boot sequence once the BMS has logged a full cycle reference point.

Device alarming low battery immediately after a confirmed full charge

This happens when the BMS compares the new cell's resting voltage against an OEM threshold calibrated to an aged cell's charge signature. A fresh Ni-Cd cell holds a slightly different voltage curve during the first several cycles. The alarm does not mean the battery is faulty. Run one complete charge and discharge cycle through the device — after that, the BMS recalibrates its threshold and the alarm clears. Confirm resting voltage sits at or above 12.0V after a full charge before returning the device to clinical use.

Compatible Models

BD500 defiscope

Replaces Part Numbers

110037

Technical Specifications

Voltage12.0V
Amp Hours2000mAh
Capacity2000mAh
Rate24Wh
Net Weight490g /17.28 oz
Gross Weight670g /23.63 oz
Approximate Weight670g /23.63 oz
Dimension 116.60 x 47.60 x 46.60mm

Product Highlights

  • Brand: Phillips
  • Manufacturer: CS
  • Color: White
  • Product Type: Ni-CD
  • Battery Type: Ni-CD
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The BD500 powers off mid-use even though the battery was fully charged before the shift — what's causing it?

New Ni-Cd cells have not yet reached their stable internal resistance, so the BD500's load profile during active use pulls more current than the cell can deliver cleanly in the first 10 cycles. The BMS interprets the resulting voltage sag as a low-cell condition and trips a protective shutoff. This is not a defective battery — it resolves as the cell conditions through normal charge-discharge cycles. Run at least three full cycles before returning the device to unsupervised clinical use.

The device won't power on at all after the replacement battery sat in storage for a few weeks before installation — how do I recover it?

Ni-Cd cells self-discharge during storage, and if the cell voltage dropped below the BD500's BMS recovery threshold, the device will refuse to power on. Connect the device to mains power and leave it on charge for a full charge cycle before attempting to boot. Most BMS controllers on this platform will re-initialise the cell once voltage climbs back above the minimum threshold — typically around 10.8V for a 12.0V Ni-Cd pack.

The charge indicator on the BD500 never reaches 100% on the first charge cycle with the new battery — is something wrong?

Nothing is wrong. The device's charge IC applies a conservative upper limit on the first charge of a new cell to prevent overvolt stress on unconditioned Ni-Cd chemistry. The cell is not receiving a reduced charge — the indicator logic is simply holding back the 100% flag until the cell completes one full reference cycle. Discharge the battery fully through normal device use, then run a complete charge cycle. The indicator will read 100% on the second charge.

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