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Promax CB-077 TV Explorer II Replacement Battery 7.4V

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Fits Promax TV Explorer II, TV Explorer II+, and US TV Explorer II models; replaces OEM part CB-077.
7.4V, 13000mAh lithium-ion delivers sustained power for extended field measurement sessions without mid-test shutdowns.
Connector type matches original pack; seats flush into battery slot with positive contact alignment verified on hardware.
We bench-tested the BMS under sustained probe initialization cycles; no cutoff on sensor power-up spikes typical to this instrument class.
After installing, run the full calibration sequence in the TV Explorer II menu before field deployment — the instrument maps battery state during calibration and skipping this step causes premature low-battery warnings on first measurement.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.4V

Amp

13000mAh

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.

Compatible Models

TV Explorer II TV Explorer II+ US TV Explorer II automatic TV satellite level meters

Replaces Part Numbers

CB-077

Technical Specifications

Voltage7.4V
Amp Hours13000mAh
Capacity13000mAh
Rate96.2Wh
Net Weight464g /16.37 oz
Gross Weight604g /21.31 oz
Approximate Weight604g /21.31 oz
Dimension 186.34 x 66.70 x 18.28mm

Product Highlights

  • Brand: Promax
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My TV Explorer II powers on fine but shuts itself off the moment I start a full-band scan — the battery was fully charged this morning. What's happening?

A full-band scan puts the RF front-end, display, and processing under simultaneous load, and that combined draw can pull the pack voltage down fast enough to trip the BMS cutoff — even from a full charge, if the cells are weak or the pack is cold. This battery's 96.2Wh capacity is sized to handle that sustained load without the voltage sag that triggers an emergency shutdown. Fit the new pack, run the calibration cycle in the system menu, then retest the scan. If it still cuts out, check that the battery contacts in the bay are clean and seating fully.

My signal readings are jumping around and resetting mid-session even though the battery indicator shows plenty of charge — could the battery be causing this?

Yes. Voltage dropout under sustained sensor load is a known cause of unstable readings on the Explorer II — the display indicator lags behind actual cell voltage, so it can show three bars while the pack is already sagging under load. When voltage dips briefly below the instrument's operating floor, the measurement processor resets its reference and you see readings drift or restart. Swap in this replacement pack, complete the post-install calibration cycle, and rerun your test session. If readings stabilise, the old pack's cells had lost enough capacity to cause intermittent dropout.

The TV Explorer II powers on and shows normal battery level, but it shuts down immediately when I plug in the USB cable to transfer logged data to my laptop. Why?

USB data transfer adds a secondary current draw on top of whatever the instrument is already running — together, they can exceed what a degraded pack can supply without tripping the BMS protection circuit. The instrument reads the combined draw as an overcurrent event and cuts power to protect itself. This pack's capacity and cell condition handle the combined USB-plus-instrument load without hitting that threshold. After fitting and calibrating the new battery, initiate the USB transfer while the instrument is at rest — not mid-scan — to keep the total draw at its lowest.

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