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Airbus TPH900 Replacement Battery 3.7V 3600mAh Li-ion

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From $92.99 USD $113.99
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Fits Airbus TPH900 two-way radio; replaces OEM HR8940AAA04 and VKB56468 702 013 battery packs.
3.7V, 3600mAh lithium-ion cell delivers sustained RF output without mid-transmission voltage sag on TPH900.
Connector seats flush into TPH900 radio bay with positive contact alignment; no adapter required.
We bench-tested this cell in a TPH900 dock—BMS accepted the pack on first insertion with clean contact cycle.
On first TPH900 insertion, if the charger dock shows a fault LED, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly—the Airbus platform requires a clean contact cycle to accept the new BMS handshake before charging begins.
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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🔹 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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Voltage

3.7V

Amp

3600mAh

Airbus TPH900 — 3.7V Li-ion Replacement Battery (HR8940AAA04)

This is a 3.7V, 3600mAh Li-ion replacement battery for the Airbus TPH900 portable two-way radio. It carries OEM part numbers HR8940AAA04 and VKB56468 702 013. The cell fits directly into the TPH900 battery bay and communicates with the radio's BMS over the standard contact strip.

  • TPH900 platform fit: The TPH900 operates on a single-cell 3.7V lithium-ion architecture with a multi-pin contact interface that carries both power and BMS data. The replacement cell matches that voltage rail and connector pinout exactly, so the radio's charge and discharge logic runs without modification.
  • Bench tested on actual hardware: We cycled this pack through transmit and receive loads on the bench. The BMS held cutoff at the correct thresholds under both sustained PTT draw and standby current, with no false overcurrent trips during the high-current transmit spike.
  • First-insertion contact check: If the TPH900 charger dock shows a fault LED on first insertion, remove the battery and wipe the gold contact strip with a dry cloth before reseating. The dock requires a clean contact cycle to complete the BMS handshake before it will begin charging.

Why the TPH900 cuts out mid-transmission on a new battery

When PTT is pressed, transmit current spikes sharply — often two to three times the standby draw. If the battery contacts are contaminated or the BMS has not completed its initialisation handshake with the radio, that current spike can trip an overcurrent flag and drop the transmission. This is not a cell fault. It is a contact or handshake issue. Clean the contact strip, reseat the pack firmly, and allow the radio to sit powered on for 60 seconds before transmitting to let the BMS settle.

Bar indicator showing fewer bars than expected after fitting a new pack

New Li-ion cells ship at storage voltage — typically around 3.6V to 3.75V — which sits below a full-charge reading on the TPH900's voltage-threshold bar indicator. The radio reads cell voltage and maps it to bars, so a new uncharged pack will display one or two bars even though the cell is not depleted. This is not a fault. Seat the battery in the dock and run a full charge cycle first. The bar indicator should read full once the cell reaches approximately 4.2V.

Compatible Models

TPH900

Replaces Part Numbers

HR8940AAA04 VKB56468 702 013

Technical Specifications

Voltage3.7V
Amp Hours3600mAh
Capacity3600mAh
Rate13.32Wh
Net Weight102g /3.60 oz
Gross Weight137g /4.83 oz
Approximate Weight137g /4.83 oz
Dimension 117.90 x 54.50 x 18.00mm

Product Highlights

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

Frequently Asked Questions

My TPH900 drops to low-power TX halfway through a shift — is the battery failing?

Voltage sag under sustained RF output is the most likely cause. During extended transmissions, cell voltage dips under load; if it drops below the TPH900's reduced-power threshold, the radio cuts RF output to protect the circuit. This is more common early in a replacement pack's life before the cells have been through a full conditioning cycle. Run two or three full charge-discharge cycles and check whether the sag persists — if it does, measure resting voltage after a full charge; it should read 4.1V to 4.2V at the contacts.

The charger dock fault LED won't clear no matter how many times I reseat the TPH900 battery — what's wrong?

A fault LED that never clears usually means the cell voltage has dropped below the dock's acceptance threshold — typically under 3.0V. This happens after extended storage or if the pack was left fully discharged. The dock's charge controller will not initiate a charge cycle on a cell it reads as critically low. Use a compatible external Li-ion charger set to recovery or boost mode to bring the cell above 3.0V, then reseat it in the TPH900 dock to resume normal charging.

The TPH900 powers on fine but the dock never transitions from charging to full — it just blinks indefinitely.

This points to a cell impedance mismatch between the new pack and the dock's charge termination logic. The dock monitors voltage rise rate to detect full charge; if internal cell impedance is slightly higher than expected, the voltage curve flattens early and the termination signal never triggers. Remove the pack, let it cool to room temperature, and reinsert it — thermal expansion during charging can compress contacts and worsen the impedance reading. If the issue continues, check that the contact pins on the dock are clean and making full contact with all three pads on the battery.

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