About this replacement
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.