Pure Move 400D Compatible Battery 3.7V 5200mAh Li-ion

Pure Move 400D — 3.7V Li-ion Replacement Battery (LC18650-2P)

This is a 3.7V Li-ion battery rated at 5200mAh (19.24Wh), built to fit the Pure Move 400D portable DAB digital radio. It replaces the original LC18650-2P cell pack when charge capacity has degraded to the point where listening sessions become noticeably short. Voltage and connector match the Move 400D's power circuit exactly.

• Move 400D compatibility: The Move 400D runs on a single-cell 3.7V Li-ion architecture with a two-cell parallel pack (LC18650-2P). That parallel configuration doubles capacity without changing the voltage rail, which is why any replacement must match both the nominal voltage and the physical cell arrangement — not just capacity.
• Bench tested on actual hardware: We cycled this pack through the Move 400D's charge circuit and confirmed the BMS accepted charge without triggering overcurrent flags. Cell balance across the parallel pack stayed within tolerance through full charge and controlled discharge.
• Station list after power loss: After installing this battery, let the Move 400D complete a full automatic station scan before tuning manually. DAB station lists are held in volatile memory and are cleared when power is interrupted — a fresh scan rebuilds the complete station index for your area.

Radio cutting out mid-station at low battery

The Move 400D's DAB decoder needs a stable voltage to reassemble the OFDM signal and decode the audio stream without errors. When cell voltage sags under the decoder's minimum threshold — typically around 3.2V under load — the chipset loses lock on the multiplex and the audio drops out. This is not a tuner fault. It is a voltage floor problem. If the radio cuts out repeatedly before the low-battery indicator appears, the existing cell pack has lost enough capacity that resting voltage no longer reflects true load voltage — swap the battery and the behaviour stops.

Reception noticeably worse in weak signal areas after a battery swap

In areas with a marginal DAB signal, the Move 400D's RF front end draws more current as it tries to lock onto a weaker multiplex. If the replacement cell has not completed a full first charge cycle, available current under RF load may be lower than rated. Charge the battery fully — to 4.2V at the cell — before using the radio in a location where signal strength is borderline. A fully charged pack gives the RF stage the headroom it needs to hold a clean lock.