About this replacement
Promax 8 Premium CATV Analyser & SAT Hunter — 7.4V Li-ion Replacement Battery (CB-076)
This is a 7.4V, 2600mAh (19.24Wh) Li-ion replacement battery for the Promax 8 Premium, 8 Premium CATV Analyser, and SAT Hunter field instruments. It uses OEM part number CB-076 and slots directly into the battery compartment of each supported model. Voltage and capacity match the original specification.
- 8 Premium, CATV Analyser, and SAT Hunter compatibility: All three models run the same 7.4V battery rail and share the CB-076 form factor and connector pinout. The BMS handshake protocol is identical across the range, so one pack covers all three without any firmware conflict.
- Bench tested on actual hardware: We cycled this pack through probe initialisation and sustained signal scanning loads. The BMS handled the current spike at sensor power-up without tripping into protection mode, and voltage held steady through extended measurement sessions.
- First-install calibration step: After fitting this pack, run a full calibration cycle through the instrument menu before heading to site. The Promax 8 series maps battery state during calibration — skipping this step causes the low-battery indicator to fire early on the first measurement session, even with a full charge.
BMS cutoff when the probe or sensor module initialises
When the Promax 8 Premium powers up a probe or external sensor module, there is a brief current spike as the module draws inrush current. A degraded or deeply discharged original battery cannot sustain voltage through that spike, and the BMS trips into protection mode — shutting the instrument off immediately after the probe connects. This replacement pack's cells handle the inrush without the voltage dropping below the BMS cutoff threshold. If the instrument still cuts out at probe connection, check that the battery has reached at least 7.8V before attempting module initialisation.
Pack will not charge after the instrument sat unused for months
Li-ion cells that self-discharge below roughly 2.5V per cell enter a deep-discharge state where the BMS locks out charging to protect the cells. The charger appears to accept the pack but delivers no current, and the instrument shows no charge progress. Place the pack on the charger and leave it connected for at least 30–45 minutes — most BMS circuits include a trickle pre-charge stage that slowly recovers cell voltage before opening the main charge path. If the pack reaches 7.4V and the charge indicator updates, the recovery has worked. If voltage stays below 6.0V after an hour, the cells have not recovered and a new pack is needed.