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SurgiTel Eclipse EHL65 Replacement Battery 7.4V 3400mAh

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From $36.99 USD $45.99
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Fits SurgiTel Eclipse EHL65 surgical headlight, replaces OEM part 25458 and OM0134.
7.4V 3400mAh lithium-ion cell delivers consistent LED illumination power throughout surgical procedures.
Battery slides into the handpiece slot with a single-position connector; locking tab seats flush with device housing.
We bench-tested this cell in the EHL65 platform; the BMS accepted the new pack after one full charge cycle without fault codes.
After installation, allow the headlight to complete its power-on self-test cycle uninterrupted — the device verifies BMS compatibility at startup, and stopping this sequence triggers a false low-battery alarm that clears only on 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.

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.

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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

7.4V

Amp

3400mAh

SurgiTel Eclipse EHL65 — 7.4V Li-ion Replacement Battery (25458)

This is a 7.4V 3400mAh lithium-ion battery for the SurgiTel Eclipse EHL65 surgical headlight system. It also fits the EHL-65 and Odyssey Analog platforms. OEM part numbers 25458 and OM0134 both cross to this cell.

  • Eclipse EHL65, EHL-65, and Odyssey Analog compatibility: All three platforms run the same 7.4V two-cell Li-ion architecture with a shared BMS connector pinout. The charge management IC expects identical cutoff thresholds across the range, so one cell services all three without any firmware conflict.
  • Bench tested on actual hardware: We cycled this cell through the Eclipse headlight's charge and discharge sequence. The BMS accepted the cell on first insertion, completed the charge handshake without fault codes, and the LED driver drew current at rated load throughout the test.
  • Post-swap self-test protocol: After installing this battery, let the Eclipse headlight complete its full power-on self-test cycle before use. The BMS runs a voltage verification at startup — interrupting it before the sequence finishes can register a false battery fault that sticks until the next clean reboot.

Why the Eclipse EHL65 alarms low battery immediately after a confirmed full charge

The Eclipse headlight's BMS compares the new cell's resting voltage against a stored OEM chemistry profile. A fresh replacement cell that hasn't completed one full charge-discharge cycle may sit just below the BMS acceptance threshold, triggering an immediate low-battery flag even when the cell is physically full. This is a calibration gap, not a faulty battery. Run one complete charge-discharge cycle and the BMS updates its reference — the alarm clears after that cycle finishes.

Eclipse headlight won't power on after the battery sat in storage

Li-ion cells self-discharge during storage. If the resting voltage drops below approximately 2.5V per cell — 5.0V at the pack level — the BMS enters a protection lockout and blocks output entirely to prevent cell damage. The headlight shows no response at all: no light, no boot sequence, no fault code. Place the battery on the charger for a minimum of 30 minutes before attempting to power the device; most chargers apply a recovery trickle below 6.0V that brings the pack back above the BMS re-enable threshold.

Compatible Models

Eclipse EHL65 EHL-65 Odyssey Analog

Replaces Part Numbers

25458 OM0134

Technical Specifications

Voltage7.4V
Amp Hours3400mAh
Capacity3400mAh
Rate25.16Wh
Net Weight99g /3.49 oz
Gross Weight124g /4.37 oz
Approximate Weight124g /4.37 oz
Dimension 66.60 x 37.00 x 19.60mm

Product Highlights

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

Frequently Asked Questions

The Eclipse headlight shuts off mid-procedure even though the battery was fully charged before the case — what's causing it?

New cells have slightly higher internal resistance in the first 10 charge-discharge cycles, and the Eclipse headlight's LED driver draws a sharp load spike at startup and during brightness transitions. That load pulls the terminal voltage down momentarily, and the BMS interprets it as a depleted cell and cuts output. This isn't a defective battery — it's the cell conditioning period. Complete 5 full charge-discharge cycles before clinical use and the cutoff threshold stabilises.

The charge indicator on the Eclipse charger never reaches 100% on the first charge with this new battery — is the charger faulty?

The charger isn't faulty. The charge IC applies a conservative top-off limit on the first cycle when it detects a new cell, keeping the charge termination voltage slightly below the 8.4V full-charge ceiling until the cell's internal resistance profile is established. This is normal behaviour. Let the charger run to natural termination without interrupting it — by the second or third cycle the indicator will reach 100% consistently.

The Eclipse headlight fails its startup self-test after swapping in a fresh battery — the original battery passed every time. What went wrong?

The BMS runs a voltage-ramp verification during the boot sequence and compares it against a learned cell profile from the previous battery. A new cell with no learned profile can produce a marginal result on that first self-test, triggering a fault flag. This does not mean the battery is defective. Allow the device to complete one full charge-discharge cycle, then reboot — the BMS writes the new cell's profile on that cycle and self-test results return to normal. Do not use the device clinically until it passes a clean self-test.

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