MetroPCS HWM570 Replacement Battery 3.7V 700mAh Li-ion

MetroPCS HWM570 / Verge — 3.7V Li-ion Replacement Battery

This is a 3.7V, 700mAh Li-ion cell for the MetroPCS HWM570 and Verge handsets. It slots into the same battery bay as the original and connects to the same charge management circuit. Capacity figure comes from product data: 700mAh (2.59Wh).

• HWM570 and Verge shared platform: Both models run on the same voltage rail and use the same physical cell format — 54.05 × 34.10 × 5.40mm. The charge IC expects a 3.7V nominal cell with a 4.2V charge ceiling. Either model will accept this cell without modification to the battery contacts or BMS handshake.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the HWM570 platform. The onboard charge IC accepted the cell on first insertion, hit the 4.2V cutoff cleanly, and the BMS did not flag an incompatible cell event at any point during testing.
• Fuel gauge recalibration on first cycle: After fitting this cell, disable any fast-charge mode for one full discharge-charge cycle. The fuel gauge IC in the HWM570 was calibrated to the original cell's discharge curve. Running one slow cycle first lets the coulomb counter reset against the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the HWM570 after a cell swap

The HWM570's modem and display draw a combined current spike during active calls and screen-on events. A new cell with a slightly different internal resistance profile can hit a voltage sag that trips the BMS low-voltage cutoff before the fuel gauge reads zero. The phone shuts off abruptly even though the percentage indicator still shows charge remaining. Running one full discharge down to automatic shutdown — then a full charge to 100% — resets the coulomb counter and brings the percentage readout in line with actual cell state.

Phone shows erratic percentage jumps after replacement cell installed

The fuel gauge IC stores a learned discharge model from the old cell. When a new cell goes in, the stored curve no longer matches actual voltage-to-capacity behaviour, so the percentage display jumps or skips. This is not a faulty cell — it is the IC recalibrating. Let the phone discharge to auto-shutdown once and then charge uninterrupted to 100% at standard charge rate. After that single cycle the fuel gauge stabilises against the new cell's actual discharge profile.