Nedis WLTK1010BK Compatible Battery 3.7V 1100mAh

Nedis WLTK1010BK — 3.7V Li-ion Replacement Battery

This 3.7V, 1100mAh Li-ion battery replaces the factory pack in the Nedis WLTK1010BK two-way radio. It fits the slim battery bay on this PMR446 handheld and restores transmit and standby capability. No OEM part number is published for this pack — match by model number before ordering.

• WLTK1010BK platform fit: The WLTK1010BK runs a single-cell 3.7V Li-ion architecture. The replacement cell must match that voltage rail exactly — a mismatched nominal voltage trips the radio's low-voltage protection and prevents transmit even if the dock shows charging.
• Bench tested on actual hardware: We cycled this pack through transmit bursts at PMR446 output levels and monitored BMS response. The protection circuit held cutoff cleanly at the low-voltage threshold and recovered without latching on return to dock voltage.
• First-insertion contact cycle on the WLTK1010BK dock: The WLTK1010BK dock reads the pack via its contact strip before accepting a charge cycle. If the dock LED blinks fault on first insertion, remove the pack, wipe the contact pads with a dry cloth, and reseat firmly — this clears any oxidation gap that blocks the initial BMS handshake.

PTT transmit spike and BMS overcurrent on the WLTK1010BK

Pressing PTT on a PMR446 radio draws a sharp current spike in the first milliseconds of transmission. A new cell at storage voltage — typically around 3.6V — has slightly higher internal impedance than a fully charged cell at 4.1V. If the BMS detects that spike as an overcurrent event, it cuts the output rail instantly. The radio goes silent mid-key. Charge the pack fully to 4.2V before the first transmit session and the impedance drops enough to keep the BMS within its trip threshold.

Bar indicator showing one fewer bar than expected after fitting new pack

The WLTK1010BK uses voltage-threshold bar indicators — each bar corresponds to a voltage band, not a fuel gauge reading. A new pack shipped at storage voltage of roughly 3.6V will display one or two bars even though the cell is not depleted. This is normal. Dock the radio and charge to full before reading the indicator — at 4.1V the display will show maximum bars and the reading will be stable across shifts.