About this replacement
Fluke SigmaPace 1000 — 7.2V Ni-MH Replacement Battery (2229830)
This 7.2V, 2700mAh Ni-MH battery replaces the original pack in the Fluke SigmaPace 1000 portable telecommunications survey instrument. It fits the same bay, uses the same connector, and matches the BMS handshake the instrument expects at startup. Capacity is rated at 19.44Wh from factory-tested cells.
- SigmaPace 1000 compatibility: The SigmaPace 1000 uses a 7.2V Ni-MH cell stack with a specific discharge curve the onboard power management tracks during signal acquisition sessions. This pack matches that curve — the instrument's power rail stays stable through probe initialisation and sustained measurement logging.
- Bench tested on actual hardware: We cycled this pack through the SigmaPace 1000's startup sequence, including probe power-up. The BMS cleared without tripping on the inrush current spike at initialisation, and voltage held within spec across a sustained logging load.
- First-use calibration on the SigmaPace 1000: After installing this pack, run a full calibration cycle through the instrument menu before taking it into the field. The SigmaPace 1000 maps battery state during calibration — skipping this step causes the low-battery indicator to trigger prematurely on your first measurement session, even with a fully charged pack.
BMS lockout after the SigmaPace 1000 sat unused in a carry case
Ni-MH packs self-discharge at roughly 1–3% per day at room temperature. After several months in storage, the cell voltage can drop below the BMS recovery threshold — typically around 5.5V for a 7.2V Ni-MH stack. When the instrument sees a pack below that threshold, it refuses to accept a charge and shows no response on the display. The fix is a low-current trickle charge applied externally or through a compatible Ni-MH charger until the pack recovers above 6.0V, at which point normal charging resumes.
SigmaPace 1000 readings resetting or dropping during a logging session
This happens when the battery voltage sags under sustained sensor load — not a full shutdown, but a momentary dropout that causes the instrument's processor to reset mid-session. It is common in aged cells with elevated internal resistance, where voltage collapses briefly under continuous draw even though the pack reads adequate capacity at rest. A replacement pack with healthy cells eliminates the sag. After fitting this battery, verify resting voltage reads at or above 7.8V before deploying — that confirms the cells are fully charged and internal resistance is within normal range.