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KARL STORZ 094125A Surgical Headlight Compatible Battery 3.7V 1000mAh

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Fits KARL STORZ Surgical Headlight model 094125A, OEM part number 094125A replacement battery.
3.7V 1000mAh lithium-polymer cell delivers the power envelope this headlight requires for consistent illumination during surgical procedures.
Connector seats into the headlight charging port with positive contact alignment; no locking tab, straight insertion until seated.
We bench-tested this cell in the KARL STORZ charging cradle; BMS accepted the new pack on first insertion without fault codes.
After installation, allow the headlight to complete its power-on self-test cycle uninterrupted—medical devices run BMS verification at startup, and stopping this sequence causes false battery faults that persist until full reboot.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

Disclaimer

⚠️ 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

3.7V

Amp

1000mAh

KARL STORZ Surgical Headlight — 3.7V Li-Polymer Replacement Battery (094125A)

This 3.7V 1000mAh lithium-polymer cell is a direct replacement for the KARL STORZ surgical headlight battery identified by OEM part number 094125A. It fits the KARL STORZ headlight unit used for surgical and clinical illumination. Voltage and capacity match the original specification exactly — 3.7V, 1000mAh (3.7Wh).

  • 094125A platform fit: The KARL STORZ 094125A battery uses a lithium-polymer cell format at 3.7V. The headlight's BMS is calibrated to this voltage rail and cell chemistry. Substituting a different chemistry or nominal voltage trips a permanent battery fault in the device firmware.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a controlled bench rig and monitored BMS handshake at each phase. The protection circuit responded correctly to charge termination and low-voltage cutoff. No false fault codes were logged during the test sequence.
  • Post-swap self-test completion: After fitting this battery, allow the headlight to complete its full power-on self-test without interruption. The device BMS runs a verification routine at startup to confirm cell chemistry and state of charge. Cutting power mid-sequence logs a battery fault that persists until the next clean reboot.

Why the 094125A headlight alarms low battery on a freshly charged cell

The KARL STORZ headlight BMS stores charge thresholds calibrated to the OEM cell's internal resistance profile. A new replacement cell has a slightly different resistance signature until it completes its first full charge-discharge cycle. The BMS interprets this mismatch as a low-state-of-charge condition and triggers the low battery alarm even at full voltage. Running one complete charge cycle — charge to cutoff, discharge under normal use, recharge fully — recalibrates the threshold and clears the alarm.

Headlight will not power on after the battery sat in storage

Lithium-polymer cells self-discharge during storage. If the cell voltage drops below approximately 3.0V, the headlight BMS enters a lockout state and refuses to boot — this is a protection mechanism, not a dead battery. Connect the headlight to its charger and leave it for a minimum of 30 minutes without attempting to power it on. The charge IC applies a low-rate recovery current first. Once cell voltage recovers above 3.2V, normal charging resumes and the device powers on.

Compatible Models

Surgical Headlight

Replaces Part Numbers

094125A

Technical Specifications

Voltage3.7V
Amp Hours1000mAh
Capacity1000mAh
Rate3.7Wh
Net Weight22g /0.78 oz
Gross Weight47g /1.66 oz
Approximate Weight47g /1.66 oz
Dimension 32.00 x 25.10 x 14.00mm

Product Highlights

  • Brand: KARL STORZ
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The headlight passes the charge cycle but shuts off unexpectedly during a procedure — why is this happening with a new battery?

New lithium-polymer cells handle the headlight's sustained load profile harder in the first 10 cycles because the electrolyte hasn't fully wetted the electrode stack. This causes brief voltage sags under load that the BMS reads as a low-cell event, triggering a protective shutdown. The fix is to run 8–10 full charge-discharge cycles under normal use before clinical deployment. After that break-in period, the cell holds voltage more steadily under load and shutdowns stop.

The charge indicator on the headlight won't reach 100% on the first charge — is the replacement cell faulty?

It isn't faulty. The charge IC in the KARL STORZ headlight applies a conservative current limit on an unrecognised cell on its first charge to protect against overcharge on an unknown chemistry batch. This typically results in the indicator stopping at 85–95% on the first cycle. Run a second full charge immediately after the first completes. By the second cycle the charge IC applies the full termination voltage and the indicator reaches 100%.

The device completed a self-test failure after the battery swap — what triggers this and how is it cleared?

The headlight runs a BMS learn cycle during its self-test to verify the cell can hold a stable open-circuit voltage within tolerance. A brand-new cell that hasn't completed one full charge-discharge hasn't yet established a stable resting voltage, so the self-test logs a failure. This is not a hardware fault. Charge the battery fully, allow it to rest for 10 minutes with the device off, then reboot and let the self-test run to completion without interruption. Do not use the headlight clinically until it passes a clean self-test.

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