TechniSat 100 Radio Replacement Battery 3.7V 1200mAh

TechniSat Digitradio 1 / Digitradio 2 Series — 3.7V Li-ion 1200mAh Replacement Battery

This is a 3.7V Li-ion replacement battery rated at 1200mAh (4.44Wh). It fits the TechniSat 100 Radio, Digitradio 1, Digitradio 2, Digitradio 2s, and four additional models in the same family. Dimensions are 53.00 × 33.90 × 5.70mm — confirm clearance before installation.

• Cross-model fit — Digitradio family: These models share a common 3.7V single-cell architecture and the same physical footprint. The battery slides into the same bay across the range, and the BMS handshake uses the same two-wire communication line throughout the series.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a Digitradio 2 unit. The BMS accepted charge without fault codes, held voltage above 3.6V through the mid-discharge range, and cut off cleanly at the low-voltage threshold without requiring a manual reset.
• Fuel gauge recalibration after install: On first use, disable any fast-charge accessory and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Why the Digitradio reports wrong battery percentage after a cell swap

The fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour. The IC reads voltage and estimates state-of-charge against old data, so the displayed percentage drifts. One full discharge down to auto-shutoff followed by a complete charge resets the coulomb counter and realigns the estimate to the new cell.

Radio shuts off suddenly while the percentage still shows above 20%

This is a voltage-cliff failure. As the cell ages or if the replacement cell has high internal impedance, voltage drops sharply under load — speaker drive and DAB tuner draw together can pull the rail below the BMS cutoff threshold in milliseconds. The percentage display lags behind because it reads an unloaded voltage sample. Charge the unit fully, then check resting voltage with a multimeter at the battery contacts — a healthy cell at 50% charge should read above 3.7V unloaded.