Tait TP8100 Two-Way Radio Replacement Battery 7.2V 2200mAh
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Tait TP8100 Two-Way Radio Replacement Battery 7.2V 2200mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ 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.
Tait TP8100 Two-Way Radio Replacement Battery 7.2V 2200mAh - is backordered and will ship as soon as it is back in stock.
Voltage
7.2V
Amp
2200mAh
Tait TP8100 Series — 7.2V Ni-MH Replacement Battery (TT35L1-D)
This 7.2V, 2200mAh Ni-MH battery replaces the original pack in the Tait TP8100, TP8110, TP8115, and TP8120 handheld transceivers. It matches the OEM voltage rail and connector used across the TP8100 platform. Capacity is rated at 15.84Wh per the manufacturer spec.
- TP8100 platform fit: The TP8100, TP8110, TP8115, and TP8120 all share the same battery bay geometry, contact pin layout, and 7.2V supply rail. One pack services all four models without adapter or modification.
- Bench tested on actual hardware: We ran this pack through transmit-cycle load testing on the TP8100 platform. The BMS handled the PTT current spike without triggering overcurrent lockout, and the cells held voltage within spec across sustained RF output.
- First-insertion contact check: If the Tait charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The dock requires a clean contact cycle to initiate the BMS handshake before charging begins.
Why the TP8100 drops to reduced TX power mid-shift on a fresh pack
Ni-MH cells ship at partial storage voltage, not full charge. When the radio draws peak transmit current from an incompletely charged pack, the cell voltage sags below the radio's RF output threshold. The TP8100 firmware responds by stepping down transmit power rather than cutting off entirely. A full charge cycle before first use eliminates this — the dock green light confirms the pack has reached capacity.
Bar indicator showing one fewer bar than expected after fitting a new TT35L1-D
The TP8100 reads battery level using voltage thresholds, not a fuel gauge chip. A new Ni-MH pack at storage voltage sits below the top threshold, so the radio displays one bar short even with a new pack installed. This is not a fault. Seat the pack in the dock and complete a full charge cycle — once cell voltage rises above the top threshold, the indicator will show the correct bar count.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
My TP8100 cuts out completely when I press PTT — could the new battery be causing this?
A hard cutout on PTT points to a BMS overcurrent trip, not a faulty cell. The transmit current spike on the TP8100 can exceed the BMS protection threshold if the pack hasn't completed its first full charge cycle, because cell impedance is higher at storage voltage. We confirmed this behaviour on the bench — a fully charged pack cleared the fault entirely. Seat the pack in the dock, charge until the green light confirms full capacity, then test PTT again.
The charger dock fault LED came on and never cleared after I inserted the new pack — what's happening?
A fault LED that won't clear usually means the pack voltage is below the dock's acceptance threshold — common on Ni-MH packs that have been in storage. The dock won't initiate a charge cycle if it reads the pack as too far discharged. Remove the pack, wipe the gold contact strip with a dry cloth, reseat it firmly, and check the LED again. If the fault persists, the pack may need a recovery charge — some Tait docks have a recovery mode activated by holding the pack seated for 30 seconds before the LED re-evaluates.
The new battery feels fully charged but the radio's signal bars keep dropping during a long shift — is the pack defective?
This is voltage sag under sustained RF output, not a defective pack. Ni-MH cells under continuous high-draw transmit cycles show a measurable voltage drop that the TP8100's threshold indicators read as capacity loss. It's more pronounced in hot environments because cell internal resistance rises with temperature. Keep the radio out of direct sun during shifts and allow the pack to cool between heavy-use periods — resting cell voltage should recover to above 7.0V between transmit bursts.
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