About this replacement
Woodpecker Woodpex III / LED-E Curing Light — 3.7V Li-ion Replacement Battery (E-1115)
This 3.7V, 800mAh Li-ion cell replaces part number E-1115 in the Woodpecker Dental Apex Locator Woodpex III and the Woodpecker LED-E Curing Light. Both are clinical devices used chairside during endodontic and restorative procedures. Capacity matches the original specification at 800mAh (2.96Wh).
- Woodpex III and LED-E shared cell platform: Both devices draw from the same 3.7V Li-ion cell format with identical connector and physical footprint. The BMS in each unit reads cell impedance at startup — the E-1115 cell chemistry passes that handshake without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Woodpex III platform. The BMS completed voltage verification and the device advanced past the startup self-test without triggering a battery fault flag.
- First-cycle conditioning on medical devices: After fitting this cell, allow the Woodpex III to complete its full power-on self-test without interrupting the boot sequence. The BMS runs a chemistry verification pass at startup — cutting power mid-sequence can log a persistent battery fault that survives until the next clean reboot cycle.
Why the Woodpex III alarms low battery with a freshly charged replacement installed
The Woodpex III BMS compares cell impedance and open-circuit voltage against thresholds calibrated to the original OEM cell. A new replacement cell, even at full charge, presents slightly different impedance than a conditioned cell. This triggers the low-battery alarm on the first one or two power cycles. Run one full charge-discharge cycle before clinical use — the BMS recalibrates its internal baseline after the first complete cycle and the alarm clears.
Woodpex III failing to power on after the battery sat in storage
Li-ion cells self-discharge at roughly 2–3% per month. If this cell has been in storage for several months, its open-circuit voltage may have dropped below the Woodpex III BMS recovery threshold — typically around 2.5V. At that voltage, the BMS blocks power delivery to protect the cell from damage. Connect the device to its charger and leave it for at least 30–60 minutes before attempting to power on. If the charge indicator does not respond, the cell voltage has dropped too low for the charger IC to engage — use a bench charger to recover the cell to above 3.0V first.