About this replacement
Fluke 1730 Three-Phase Electrical Energy Logger — 3.7V Li-ion Replacement Battery (4146702)
This 3.7V 2200mAh Li-ion battery replaces the internal pack in the Fluke 1730 Three-Phase Electrical Energy Logger. It fits the 1730 and 1730 Energie Logger variants. Swap it out when the original pack no longer holds a charge between site visits.
- 1730 series compatibility: All 1730 variants share the same battery bay, connector pinout, and BMS communication protocol. The pack reports state-of-charge data back to the instrument's firmware — so the replacement must match the OEM voltage rail exactly at 3.7V nominal.
- Bench tested on actual hardware: We cycled this pack through the 1730's charge and discharge routines. The BMS handshake completed correctly each time, and the cell voltage held stable under the sustained sensor load the instrument draws during a multi-hour logging session.
- First-use calibration on the 1730: After installing, run a full calibration cycle through the instrument menu before field deployment. The 1730 maps battery state during calibration — skipping this step causes premature low-battery warnings to appear during your first measurement session.
BMS lockout after the 1730 sat unused in a carry case for months
Li-ion cells self-discharge at roughly 1–2% per month at room temperature. If the 1730 sat powered off for an extended period, the pack can drop below the BMS recovery threshold — typically around 2.5V per cell — and the protection circuit latches off. The instrument will appear completely dead even on charge. To recover, connect the charger and leave it for 30–45 minutes before attempting to power on; most BMS circuits will re-initialise once the cell voltage climbs above 2.8V.
Readings drifting or logging session resetting mid-survey
The 1730 draws a sustained load across all three measurement channels simultaneously during a logging session. An aged or partially discharged pack can experience voltage dropout under this load even when the state-of-charge indicator still shows capacity remaining. The dropout trips an undervoltage reset in the instrument firmware, which interrupts the active log file. If sessions are cutting out unexpectedly, check the open-circuit voltage of the pack — a healthy 3.7V nominal cell should rest above 3.6V after a full charge cycle.