About this replacement
Roberts Sports DAB2 — 3.7V Li-Polymer Replacement Battery (D8110-21-00447)
This 3.7V, 1850mAh Li-Polymer battery replaces the original pack in the Roberts Sports DAB2 portable digital radio. It fits the DAB/FM tuner directly using the OEM part number D8110-21-00447. Swap it in when the original pack no longer holds a usable charge through a listening session away from mains power.
- Roberts Sports DAB2 fit: The Sports DAB2 uses a single-cell Li-Polymer pack at 3.7V nominal. The connector pinout and BMS communication match the OEM spec, so the radio's charge controller recognises the cell and manages charge termination correctly.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the Sports DAB2 platform. The BMS responded correctly to charge termination at 4.2V and held the radio's RF and decoder stages at stable voltage through the discharge curve.
- First-use station scan: After fitting this battery, run a full auto-scan before tuning manually. The Sports DAB2 holds its station list in volatile memory — any power interruption resets it, and the radio needs a fresh scan to rebuild the complete station index for your area.
Radio cutting out mid-station at low battery on the Sports DAB2
The DAB decoder in the Sports DAB2 requires a stable supply voltage to maintain stream synchronisation. When cell voltage sags toward the lower end of the discharge curve, the decoder loses lock on the multiplex and the audio drops out — even though the radio appears to still be on. This is not a tuning fault. A fresh cell holds voltage flat across most of its discharge range, which keeps the decoder stage fed above its minimum threshold.
Battery draining faster than expected in areas with poor DAB coverage
In weak signal areas, the Roberts Sports DAB2 increases the power its RF front-end draws while searching for and locking onto DAB multiplexes. This draws more current from the cell than normal listening conditions. The result is noticeably shorter use between charges compared to strong-signal environments. If drain seems excessive, check signal strength in the radio's info menu — a consistently low signal reading confirms the RF stage is working harder, not a fault with the battery.