Zastone X6 WLN KD-C1 Compatible Battery 3.7V 1100mAh

Zastone X6 / WLN KD-C1 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1100mAh Li-ion battery for the Zastone X6 and WLN KD-C1 portable walkie-talkies. It slots into the original battery bay and restores full transmit and receive function. Dimensions are 53.00 × 33.90 × 5.70mm — verify your bay matches before ordering.

• X6 and KD-C1 platform fit: Both radios share the same 3.7V single-cell architecture, battery footprint, and contact layout. One cell format covers both units — no adapter or modification needed.
• Bench tested on actual hardware: We cycled this pack through full charge and PTT transmit loads on compatible hardware. The BMS handled the transmit current spike without tripping, and charge acceptance was normal from the first cycle.
• Contact strip condition on first insertion: If the charger shows a fault or blink on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The charger needs a clean contact to recognise the BMS and begin charge acceptance.

Why the KD-C1 cuts out mid-transmission on a freshly inserted battery

New Li-ion cells ship at storage voltage — typically 3.6V to 3.7V — not full charge. When you key up, the transmit current draw pulls cell voltage below the BMS low-voltage cutoff threshold before the cell has been fully charged. The radio interprets this as a depleted pack and shuts RF output. Charge the battery fully before the first transmission-heavy use to avoid this.

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

The X6 and KD-C1 use a simple voltage-threshold bar indicator — each bar corresponds to a voltage step, not a percentage. A new cell may read one bar low immediately after charge if the resting voltage hasn't stabilised. Let the pack rest off charge for 10–15 minutes. Resting open-circuit voltage should settle at or above 4.15V, at which point the indicator catches up to the actual state of charge.