Doro BP-MPB16 330gsm Replacement Battery 3.7V 1200mAh

Doro HandleEasy 330gsm — 3.7V Li-ion Replacement Battery (BP-MPB16)

This 3.7V, 1200mAh Li-ion cell replaces the original battery in the Doro 330gsm, HandleEasy 330, and HandleEasy 330gsm. It matches the OEM BP-MPB16 specification and fits the original battery bay without modification. When the stock cell no longer holds charge through a normal call or messaging session, this is the direct swap.

• HandleEasy 330 series compatibility: The 330, HandleEasy 330, and HandleEasy 330gsm share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. One cell covers all three variants without adapters or wiring changes.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the 330gsm platform and confirmed the BMS communicates correctly with the phone's charge IC — no false full-charge cutoffs and no premature low-battery shutdowns during testing.
• First-cycle fuel gauge reset: After fitting this cell, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before using the phone normally. This lets the fuel gauge IC map its coulomb counter to the new cell's actual discharge curve instead of the old cell's degraded profile.

Why the 330gsm reports wrong battery percentage after a cell swap

The fuel gauge IC on the 330gsm stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the fresh cell. The phone reads voltage correctly but translates it to the wrong percentage. One full discharge-charge cycle forces the IC to recalibrate against the new cell, and percentage accuracy settles within two or three cycles after that.

Sudden shutdown at 20–30% on the new cell

This is a voltage cliff, not a capacity fault. Under load from the GSM modem during a call, the cell's internal resistance causes a sharper voltage drop than the phone's low-battery threshold expects. If the cell voltage dips below the cutoff threshold — typically around 3.2V under load — the phone shuts down even though the resting voltage would read higher. Allow two full discharge-charge cycles to complete before judging cell performance. If shutdown persists below 25%, check that the battery contacts are clean and seated flat against the cell terminals.