Navon Mizu M500 Compatible Battery 3.7V 1650mAh G55133

Navon Mizu M500 / D500 / D501 — 3.7V Li-ion Replacement Battery (G55133)

This is a 3.7V, 1650mAh Li-ion replacement battery for the Navon Mizu M500, Mizu D500, and Mizu D501 smartphones. It carries OEM part number G55133 and slots into the original battery bay. Use the capacity figure from this listing — 1650mAh — not third-party sources.

• Mizu M500, D500, and D501 compatibility: All three models share the same 3.7V battery bay geometry, connector pinout, and BMS handshake protocol. One cell covers the full range without modification.
• Bench tested on actual hardware: We ran the G55133 cell through full charge and discharge cycles on a Mizu M500 unit. The BMS accepted the cell on first contact, charge termination triggered correctly at 4.2V, and protection cutoff activated as expected at low voltage.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging if available and run one complete discharge-charge cycle before normal use. The fuel gauge IC is still calibrated to your old cell's discharge curve — one full cycle lets it map the new cell and report accurate percentages.

Sudden shutdown at 20–30% on the Mizu M500 after a cell swap

This is a voltage cliff problem, not a defective cell. The Mizu M500's modem and display draw a combined load spike that the fuel gauge IC cannot predict accurately until it has mapped the new cell's discharge curve. The old coulomb counter data tells the OS there is 25% left, but the fresh cell hits its voltage floor under load before the gauge catches up. Run one full discharge down to automatic shutdown, then charge uninterrupted to 100% — after that cycle the gauge recalibrates and shutdowns stop.

OS percentage jumping erratically after fitting the G55133

Erratic percentage readings — jumping from 60% to 40% or from 15% to 3% without warning — mean the fuel gauge IC is still running calculations against the previous cell's stored data. The coulomb counter accumulated history from the degraded original battery and that history does not match the new cell's actual capacity curve. Charge the phone to 100%, let it sit on charge for 30 minutes after the indicator says full, then discharge normally to below 10% and charge again. Two full cycles clear the residual calibration data and stabilise the readout.