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

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

This is a 3.7V, 2000mAh Li-Polymer replacement cell for the Nokia Lumia 625, Lumia 625H, Lumia 720, and Lumia 720T. It slots directly into the original battery bay and connects to the same three-contact interface the phone's charge IC expects. Capacity is 2000mAh at 7.4Wh — matching the OEM BP-4GWA spec.

• Lumia 625 and 720 platform compatibility: Both handsets share the BP-4GWA footprint, contact layout, and 3.7V nominal rail. The BMS handshake on this cell matches the NTC thermistor line Nokia's charge IC polls during each charge cycle — no negotiation errors on either model.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a Lumia 720 unit. The BMS held cutoff at 4.2V on the high end and triggered protection correctly at the low-voltage threshold without triggering spurious over-current trips under screen-on load.
• Fuel gauge recalibration on first cycle: On first use after installation, run one complete discharge to near-empty before recharging to 100%. The Lumia's coulomb counter calibrates its percentage model against the new cell's actual discharge curve during this first full pass — skipping it causes the OS to display inaccurate readings for several days.

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

This is a voltage-cliff failure, not a capacity failure. When the modem fires during a call or LTE data burst, it draws a short high-current pulse. An aged or new-but-uncalibrated cell can drop below the phone's minimum voltage threshold under that load even though the fuel gauge still shows charge remaining. The phone shuts down to protect the SoC — the percentage reading was simply wrong. Running one full discharge-charge cycle lets the coulomb counter map the real voltage-capacity curve of the new cell, which eliminates most cliff shutdowns.

Phone won't power on after sitting in a drawer for months

Li-Polymer cells self-discharge in storage. If the cell drops below roughly 2.5V, the BMS trips its deep-discharge lockout and the phone will not respond to a normal charger. Plug it into a wall charger — not a PC USB port — and leave it connected for at least 30 minutes without pressing the power button. The charge IC will trickle current into the cell to bring it above the BMS re-enable threshold, after which normal charging resumes. If the phone still shows no sign of life after 45 minutes on a wall charger, check that the charger output is at least 5V 1A.