Radioddity RF23 Compatible Battery 3.7V 1200mAh Li-ion

Radioddity RF23 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1200mAh (4.44Wh) Li-ion cell for the Radioddity RF23 smartphone. It fits the compact RF23 form factor and replaces the original cell when capacity fade makes the phone unreliable. Physical dimensions are 53.00 × 33.90 × 5.70mm — confirm against your existing cell before installing.

• RF23 fit: The RF23 uses a compact single-cell 3.7V pack with a direct solder or flex-connector tab arrangement common to budget compact smartphones. Voltage and connector placement must match — swapping a cell from a different RF-series model will not work even if the body looks similar.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on bench equipment, confirming BMS cutoff engaged at the correct low-voltage threshold and that charge acceptance was stable across multiple cycles with no thermal anomaly.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the RF23 after a cell swap

The RF23's fuel gauge IC was calibrated to the discharge curve of the original cell. A new cell has a different internal resistance profile, so the IC misreads remaining capacity. When the phone hits a load spike — screen brightness, modem burst — the new cell's voltage drops below the shutdown threshold even though the gauge still reads 20–30%. One full discharge-charge cycle without fast charging resets the coulomb counter and corrects the voltage-to-percentage mapping. If shutdowns continue after two full cycles, check that cell voltage at "0%" reads no lower than 3.0V under load.

RF23 won't power on after sitting in storage with a flat battery

Li-ion cells discharged below roughly 2.5V trigger a BMS protection lockout — the pack presents 0V and the phone shows nothing when you press the power button. Plug the phone into a wall charger, not a PC USB port, and leave it for 20–30 minutes before attempting to power on. The charger's trickle-charge stage needs to push the cell back above the BMS recovery threshold, typically around 3.0V, before normal charging resumes. If the phone still shows no charge indicator after 45 minutes on a wall adapter, the cell may have dropped below recoverable voltage and will need replacement.