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Tait TP9100 Replacement Battery 7.2V 2500mAh TPA-BA-203

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From $89.99 USD $107.99
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Fits Tait TP9100, TP9135, TP9140, TP9155 two-way radios; replaces OEM TPA-BA-203, TPA-BA-206, TPA-BA-201.
7.2V 2500mAh Ni-MH cell delivers stable voltage throughout a full shift without sag under sustained transmit load.
Bayonet connector seats firmly into the radio's battery slot with a quarter-turn locking tab for field retention.
We bench-tested this pack on a TP9100 radio under continuous PTT cycles; BMS accepted charge immediately with no dock fault light.
On first insertion into the charger dock, if the fault LED appears, remove the battery and wipe the gold contact strip with a dry cloth, then reseat firmly — Tait platforms need a clean contact cycle to complete the BMS handshake before charging begins.
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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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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

7.2V

Amp

2500mAh

Tait TP9100 Series — 7.2V Ni-MH Replacement Battery (TPA-BA-203)

This 7.2V, 2500mAh Ni-MH battery replaces the TPA-BA-203, TPA-BA-206, and TPA-BA-201 packs used in the Tait TP9100, TP9135, TP9140, and TP9155 portable radios. These are professional land mobile radios used across public safety, utilities, and enterprise field operations. Voltage and cell count match the OEM specification exactly.

  • TP9100 series compatibility: The TP9100, TP9135, TP9140, and TP9155 share the same battery bay dimensions, contact layout, and 7.2V rail. All four accept the same physical pack and BMS handshake, which is why one part number covers the range.
  • Bench tested on actual hardware: We cycled this pack on a TP9100 chassis, held PTT through a sustained transmit sequence, and confirmed the BMS did not trip on the transmit current spike. Voltage held within expected limits across repeated keying cycles.
  • First insertion into the Tait dock: Ni-MH cells ship at partial storage charge. The Tait rapid charger reads the pack voltage on insertion to determine charge state. If the dock LED flashes amber on first seat, wipe the contact strip with a dry cloth, reseat firmly, and allow the charger a full 60-second handshake cycle before assuming a fault.

Why the TP9100 cuts out mid-transmission on a freshly inserted pack

The TP9100 draws a sharp current spike the moment PTT is pressed — the transmitter PA stage pulls significantly more current than standby. On a Ni-MH cell that shipped at storage voltage, that spike can push the BMS into a momentary overcurrent trip before the cell has warmed up through a charge cycle. The radio cuts audio and drops the transmission without warning. Running the pack through one full charge cycle before field use brings the cell voltage up to working range and stops the BMS from tripping on that initial PTT spike.

Bar indicator showing one fewer bar than expected after a full charge

The TP9100 uses a voltage-threshold bar indicator — each bar corresponds to a voltage band, not a fuel gauge reading. A new Ni-MH cell can take two or three full charge-discharge cycles before it reaches peak capacity and holds the voltage needed to register the top bar. If the radio shows one bar short after the first charge, run a full discharge in the radio under normal transmit use, then recharge completely. After that second cycle, the resting voltage should sit above 7.4V and the indicator will reflect the correct charge state.

Compatible Models

TP9100 TP9135 TP9140 TP9155 TP9160

Replaces Part Numbers

TPA-BA-203 TPA-BA-206 TPA-BA-201

Technical Specifications

Voltage7.2V
Amp Hours2500mAh
Capacity2500mAh
Rate18Wh
Net Weight287.4g /10.14 oz
Gross Weight467.4g /16.49 oz
Approximate Weight467.4g /16.49 oz
Dimension 125.50 x 63.20 x 38.36mm

Product Highlights

  • Brand: Tait
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The TP9100 drops to low transmit power partway through a shift — is the battery failing or is something else happening?

This is voltage sag under sustained RF output, not a dead cell. Ni-MH cells experience a voltage drop under continuous high-draw loads, and the TP9100 reduces TX power when rail voltage falls below its operating threshold. Check the resting voltage after a full charge — it should read at or above 7.4V with a multimeter. If resting voltage is correct but sag still occurs under transmit, the cell has developed internal impedance and needs replacement.

The Tait rapid charger dock never advances past the amber fault LED after inserting this pack — what's the cause?

The dock rejects packs that present below its minimum acceptance voltage on insertion. New Ni-MH cells shipped at storage voltage can fall below that threshold. Remove the pack, wipe the gold contact strip with a dry cloth, reseat firmly, and wait a full 60 seconds — the dock needs that window to complete its voltage sample. If the fault LED persists, the pack may need a slow top-up from an alternate charger to lift it above the dock's acceptance floor before the rapid charger will engage.

This battery sat unused for several months and now the radio won't power on at all — is the pack recoverable?

Ni-MH cells self-discharge during storage and can drop below the BMS recovery threshold after extended periods. The BMS will block output entirely if cell voltage falls too low, so the radio shows nothing on power-on. Connect the pack to a compatible slow charger at a low current rate — not the rapid dock — and leave it for a full 12-hour conditioning cycle. If cell voltage recovers above 6.0V during that cycle, the BMS will release and the pack will accept a normal charge.

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