BP-4GWA Compatible Battery Microsoft Lumia 625 3.7V 2000mAh

Microsoft Lumia 625 / 720 Series — 3.7V Li-Polymer Replacement Battery (BP-4GWA)

This is a 3.7V, 2000mAh lithium-polymer replacement battery for the Microsoft Lumia 625, 625H, 720, and 720T smartphones. It carries OEM part number BP-4GWA and slots into the same battery bay as the factory cell. Voltage and connector match the original specification exactly.

• Lumia 625 / 720 platform compatibility: These four models share the same battery bay dimensions, 3.7V nominal voltage rail, and BP-4GWA connector pinout. The BMS on each handset reads the same charge termination voltage, so one cell covers all four variants without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Lumia 720. The BMS accepted charge termination at 4.2V and engaged undervoltage protection at the expected low-cell threshold with no false cutoffs during normal load cycles.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one complete discharge-to-charge cycle before normal use. The Lumia's fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve during this first cycle — skipping it causes the percentage readout to drift by up to 15% in the first week.

Sudden shutdown at 20–30% on the Lumia 625 and 720

This is the most reported failure with aged cells in the Lumia 625 and 720 — and it happens with new replacement cells too if the fuel gauge hasn't recalibrated. The cell's actual voltage drops below the modem's minimum rail voltage under load while the OS still reads 25% remaining. The phone shuts down because the hardware protection triggers, not because the gauge hit zero. After one full discharge-charge cycle, the coulomb counter realigns and the shutdowns stop.

Phone won't power on after the replacement cell sat in storage

Li-polymer cells self-discharge roughly 2–3% per month in storage. If this cell shipped at a low state of charge and sat before installation, the BMS may have entered lockout below 2.5V per cell. The Lumia won't respond to the power button in this state. Connect to a wall charger — not a PC USB port — and leave it for 20–30 minutes before attempting to power on; a wall charger supplies enough current to bring the cell back above the BMS re-enable threshold of approximately 3.0V.