About this replacement
Promax HD Ranger — 7.4V Li-ion Replacement Battery (CB-083)
This is a 7.4V, 13000mAh (96.2Wh) lithium-ion replacement battery for the Promax HD Ranger field measurement and testing instrument. It slots directly into the HD Ranger and matches the OEM part number CB-083. Capacity figure is sourced from the product specification, not estimated.
- HD Ranger platform fit: The HD Ranger draws sustained current through its measurement and probe circuitry at a consistent voltage rail. This pack matches the 7.4V nominal voltage and the BMS handshake protocol the instrument expects, so the power management system accepts it without flagging a battery fault on startup.
- Bench tested on actual hardware: We cycled this pack under simulated instrument load — including probe initialisation spikes — and confirmed the BMS held its trip threshold without nuisance cutoff. Cell balance across the pack stayed within tolerance through full discharge and recharge cycles.
- First-use calibration on the HD Ranger: After installing this pack, run a full calibration cycle through the HD Ranger's instrument menu before heading into the field. The instrument maps battery state during that calibration pass, and skipping it causes the low-battery indicator to fire early on the first measurement session — even with a full charge on board.
BMS cutoff when the HD Ranger initialises its probe or sensor module
When the HD Ranger powers up a probe or sensor module, it pulls a short, sharp current spike to initialise that subsystem. On a degraded or deeply discharged pack, this spike can cross the BMS overcurrent threshold and trip the protection circuit before the instrument even reaches its main screen. The result looks like a dead battery — but the pack itself isn't faulty. A fresh, fully charged CB-083 pack raises the cell voltage high enough that the BMS headroom absorbs the probe startup spike without tripping. If the issue persists after a full charge, check that cell voltage at the battery terminals reads at least 8.0V before insertion.
HD Ranger shuts down mid-measurement during a logging session
Sustained sensor load during active logging draws more current than standby operation, and an ageing or partially discharged pack can't hold voltage steady under that draw. When cell voltage sags below the instrument's brown-out threshold — typically around 6.4V on 7.4V Li-ion systems — the HD Ranger cuts power to protect its data and circuitry. This isn't a BMS trip; it's the instrument's own voltage monitor responding to a dropout. Fit the fully charged CB-083 pack and confirm the instrument's battery indicator reads full before starting a logging session.