Switel WTF8000 Replacement Battery BT-0947 3.6V 700mAh Ni-MH

Switel WTF8000 — 3.6V Ni-MH Replacement Battery (BT-0947)

This is a 3.6V, 700mAh Ni-MH replacement battery for the Switel WTF8000 two-way radio. It slots directly into the WTF8000 handset and restores transmit and receive function when the original pack has degraded. Part number BT-0947 confirms fitment.

• WTF8000 platform fit: The WTF8000 runs a 3.6V single-cell Ni-MH architecture with a compact form factor. This pack matches that voltage rail and the physical envelope — 44.50 × 31.00 × 11.00mm — so the contact tabs align with the dock and handset terminals correctly.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the WTF8000 platform. The BMS accepted the cell voltage on first insertion, the charger advanced to full-charge termination normally, and TX current draw during PTT hold stayed within the expected range without triggering cutoff.
• First-use contact check: Ni-MH cells ship at storage voltage — typically around 1.1–1.2V per cell. If the dock shows a fault indication on first insertion, remove the pack, wipe the contact strip with a dry cloth, and reseat firmly. This clears any contact resistance that can prevent the dock from initiating the charge cycle.

Why the WTF8000 cuts out mid-transmission on a fresh BT-0947

A new Ni-MH cell at storage voltage has not yet reached its rated capacity ceiling. When PTT is pressed, the radio draws peak transmit current — often two to three times standby draw. If the cell has not completed at least one full charge cycle, that current spike can pull the terminal voltage below the BMS cutoff threshold momentarily, dropping the transmission. Run one complete charge before extended use. After the first full cycle, the cell's internal resistance drops and it handles transmit spikes without the voltage dip that triggers cutoff.

WTF8000 bar indicator showing one fewer bar than expected after swap

The WTF8000 reads battery state through voltage thresholds, not a fuel gauge chip. A freshly charged new cell may sit at 3.6–3.7V open circuit, but under the radio's load, it reads slightly lower until the cell is broken in. This can cause the bar display to show one step below full even when the pack just came off the charger. This is not a cell fault — it resolves after two to three full charge-discharge cycles as the cell reaches its rated capacity and internal resistance stabilises. After break-in, the display should step up to the expected level under normal load.