About this replacement
Promax TV Explorer II Series — 7.4V Li-ion Replacement Battery (CB-077)
This is a 7.4V, 13000mAh (96.2Wh) lithium-ion replacement battery for the Promax TV Explorer II and TV Explorer II+. It fits the US TV Explorer II and compatible automatic TV satellite level meters using the CB-077 pack format. Technicians use these instruments for broadcast signal surveys, reception testing, and field-level measurements.
- TV Explorer II and II+ compatibility: These models share the same battery bay geometry, connector pinout, and BMS communication protocol. The CB-077 format handles the handshake the instrument expects at power-on — without it, the Explorer II throws a battery fault and refuses to boot.
- Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the TV Explorer II platform. The BMS held stable under the sustained draw of active signal scanning, and the protection circuit responded correctly to the brief current spike when the RF front-end initialised.
- Post-install calibration cycle: After fitting this battery, run a full calibration cycle through the instrument's system menu before heading to site. The Explorer II maps battery state during calibration — skip this and the low-battery warning will trigger early on your first measurement session, even with a full pack.
TV Explorer II shutting down mid-scan during active signal logging
The Explorer II draws sustained current during continuous channel scanning and constellation analysis — more than it does at idle or during simple level checks. An aged or partially discharged pack can hold an acceptable resting voltage but sag below the BMS cutoff threshold the moment that sustained load kicks in. The instrument reads this as a fault and shuts down to protect the measurement circuitry. This pack's 96.2Wh capacity provides the headroom needed to sustain that draw without hitting the sag threshold prematurely.
Explorer II not recognising the new pack after it sat unused in a carry case
Lithium-ion cells self-discharge over storage, and if a pack drops below roughly 2.5V per cell the BMS enters a sleep state to prevent damage — the instrument then sees no communication on the battery bus and refuses to power on. This is not a dead battery. Connect the pack to a charger rated for Li-ion at 7.4V and leave it for at least 30 minutes — the BMS recovery circuit needs that trickle input to wake up before the main charge cycle begins. Once the charger shows an active charging state rather than a fault light, the BMS has recovered and a full charge will follow normally.