Tekk T50AA Replacement Battery 10.8V 1200mAh Ni-MH

Tekk T50AA / T60 / CA1450 / TS470 — 10.8V Ni-MH Replacement Battery

This is a 10.8V 1200mAh Ni-MH replacement battery for the Tekk T50AA, T60, CA1450, and TS470 two-way radios. It slots into the original battery bay and connects to the same contact rail the factory pack uses. Capacity is 1200mAh (12.96Wh), matching the original specification.

• T50AA, T60, CA1450, and TS470 compatibility: These four Tekk models share the same 10.8V three-cell Ni-MH pack format, the same contact pitch, and the same charge termination logic. One replacement pack covers all four without adapters or wiring changes.
• Bench tested on actual hardware: We cycled this pack through repeated PTT transmit loads on the T50AA platform. The BMS held voltage within spec during sustained RF output bursts and recovered cleanly between transmissions without nuisance cutoff.
• First insertion into the charger dock: Ni-MH packs ship at partial charge — typically storage voltage, not full. The Tekk dock reads pack voltage before starting the charge cycle. If the dock LED blinks fault on first insertion, remove the pack, wipe the contact strip with a dry cloth, and firmly reseat it to establish a clean contact cycle before the dock accepts the pack.

Why the T50AA cuts out mid-transmission on a new Ni-MH pack

Ni-MH cells leave the factory at storage voltage — around 1.1V per cell, not the 1.2V nominal each cell needs under load. On a three-cell 10.8V pack, that gap adds up fast when the radio draws transmit current. The BMS sees the voltage dip during PTT and trips a protective cutoff before the pack is actually depleted. A single full charge cycle brings all three cells to working voltage and eliminates the cutoff behaviour entirely.

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

The Tekk T-series radios use a voltage-threshold bar indicator — each bar maps to a fixed voltage band, not a fuel gauge chip. A new Ni-MH pack that hasn't been fully cycled yet rests at a slightly lower open-circuit voltage than a conditioned cell, which can push the reading one bar low even after a complete charge. Run one full charge-discharge-recharge cycle and measure pack voltage off the charger — a healthy 10.8V Ni-MH pack should read at least 12.6V fully charged. If it does, the indicator will correct itself on the next power-on.