Doro 332 Replacement Battery 3.7V 1050mAh Li-ion

Doro 332 / 332GSM — 3.7V Li-ion Replacement Battery (HARE)

This is a 3.7V, 1050mAh Li-ion cell that replaces the original HARE battery in the Doro 332 and 332GSM. The Doro 332 is a senior-focused basic mobile phone with simplified controls and essential calling and messaging functions. Fit is direct — same voltage, same OEM part number, same form factor at 53.00 × 33.90 × 5.60mm.

• 332 and 332GSM compatibility: Both variants share the same battery bay dimensions and the same HARE part number. The voltage rail and connector are identical across these two models, so one cell covers both.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 332 platform. The BMS handshake completed without fault codes, and the protection circuit responded correctly to low-voltage cutoff thresholds during discharge.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge mode and run one complete discharge-to-charge cycle before normal use. The fuel gauge IC in the 332 is calibrated to the old cell's discharge curve — one full cycle lets it map the new cell's actual capacity before trusting the percentage readout.

Why the Doro 332 reports wrong battery percentage after a cell swap

The 332 uses a fuel gauge IC that tracks capacity by counting charge in and out of the cell — a process called coulomb counting. When you swap to a new cell, the IC still holds the old discharge curve in memory. Until it runs one full discharge-charge cycle, it maps current charge level against the wrong reference and reports inaccurate percentages. This is not a fault with the replacement cell. One full cycle — drain to automatic cutoff, then charge uninterrupted to 100% — resets the reference and restores accurate readings.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — typically during a call, when the GSM radio draws a short burst of current. At that load spike, the cell voltage dips below the BMS cutoff threshold even though the gauge still shows 20–30%. It is a voltage cliff, not a capacity fault. The fix is the same full recalibration cycle: let the phone discharge to automatic shutdown, then charge to 100% without interruption. After one cycle the gauge IC sets a more accurate low-voltage warning point, usually above 3.4V, and the premature shutdowns stop.