About this replacement
Sharp 923SH / 9020C — 3.7V Li-ion Replacement Battery (SHBBV1)
This is a 3.7V, 800mAh Li-ion cell that replaces the OEM SHBBV1 battery in the Sharp 923SH and 9020C smartphones. It matches the original form factor at 55.40 × 35.21 × 3.85mm and slots into the same battery bay with the same connector orientation. Capacity is rated at 2.96Wh, identical to the factory specification.
- 923SH and 9020C platform fit: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol, which is why one cell number — SHBBV1 — covers both. The charge IC on each device reads the same thermistor line and NTC response, so no firmware mismatch occurs on installation.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a 923SH unit, monitoring BMS cutoff at the low-voltage threshold and verifying the charge IC accepted the cell without triggering a fault flag. Charge termination occurred cleanly at 4.2V with no anomalous heat at the connector.
- Fuel gauge recalibration after swap: On first use after installation, disable fast charging and complete one full discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before any high-current session pushes current into an uncalibrated reference.
Sudden shutdown at 20–30% on the 923SH after a cell swap
This happens because the fuel gauge IC still holds the discharge curve from the old, degraded cell. When the new cell hits a voltage point that the old curve mapped to 20–30%, the IC signals a low-voltage event and the phone shuts down — even though the replacement cell has charge remaining. The modem radio or display causes a brief current spike that the IC misreads as a voltage cliff. One full discharge cycle, taken to automatic power-off, followed by an uninterrupted charge to 100%, resets the coulomb counter against the new cell's actual curve.
Phone warm near the battery compartment during the first charge
A new high-impedance cell generates more heat than a broken-in one because internal resistance is slightly elevated before the first few cycles condition the electrodes. The charge IC on the 923SH responds to this by reducing current, which is the expected behaviour — not a fault. If the warmth is localised to the battery bay and not the USB port area, the cell is operating normally. After two to three complete charge cycles, internal resistance drops and the heat normalises.