About this replacement
Tobias IQ150 Paper-Chek — 7.2V Ni-MH Replacement Battery (HHR6)
This is a 7.2V, 2000mAh Ni-MH replacement battery for the Tobias IQ150 Paper-Chek portable moisture meter. It slots directly into the IQ150 and restores full operating power for paper moisture measurement in quality control and field environments. Voltage and capacity match the original HHR6 specification.
- IQ150 Paper-Chek platform fit: The IQ150 runs a single-pack 7.2V rail with a BMS that monitors cell voltage during probe initialisation. This replacement uses the same six-cell Ni-MH configuration as the HHR6, so the BMS handshake completes without fault codes or power interruptions at startup.
- Bench tested on actual hardware: We ran this pack through repeated probe activation cycles on the IQ150. The BMS held stable across measurement sessions, and voltage stayed within the instrument's operating threshold under sustained sensor load.
- Calibration cycle before field use: After installing, run a full calibration cycle through the instrument menu before deploying to site. The IQ150 maps battery state during calibration — skipping this step causes premature low-battery warnings to appear on your first measurement session, even with a fully charged pack.
BMS cutoff at probe initialisation on the IQ150
When the IQ150 powers up its moisture probe, there is a brief current spike as the sensor circuit initialises. A degraded or deeply discharged pack can drop below the BMS cutoff threshold at that exact moment, killing the instrument before it reaches the measurement screen. This is not a fault with the meter itself — it is the BMS protecting cells that can no longer sustain the surge. A fresh pack at full charge handles the spike without voltage sag. If the instrument still cuts out after fitting this replacement, charge the new pack fully before retrying — Ni-MH cells should sit at or above 8.0V open-circuit before first use in the IQ150.
IQ150 not recognising new pack after the meter sat unused for months
Ni-MH packs self-discharge over storage, and if the original battery dropped below roughly 5.0V during long inactivity, the IQ150's BMS may have entered a sleep state it will not exit on its own. Fitting this replacement will not automatically wake the BMS if the instrument itself is in a locked-out state. Plug the IQ150 into its charger for at least 30 minutes before attempting to power on — the charger voltage pushes the BMS out of sleep mode. Once the instrument confirms charging activity on screen, disconnect, then power on normally.