BL-49KH Verizon VS920 Replacement Battery 3.7V 1600mAh

Verizon LG Intuition VS920 / Spectrum 4G — 3.7V Li-ion Replacement Battery (BL-49KH)

This is a 3.7V, 1600mAh Li-ion cell replacing the original BL-49KH battery in the LG Intuition VS920 and Spectrum 4G smartphones. It powers the processor, display, cellular radio, and GPS stack. Capacity is 1600mAh — as specified in the product data, not inflated.

• VS920 and Spectrum 4G compatibility: Both models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail — the BL-49KH fits either without modification. The BMS handshake protocol matches what LG's charge IC expects on first insertion.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge passes while monitoring BMS cutoff behaviour. The protection circuit tripped correctly at the low-voltage floor and released cleanly on reconnection — no false lockout observed.
• Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge-to-charge cycle before using the phone normally. This gives the fuel gauge IC time to map the new cell's discharge curve — skipping this step leads to erratic percentage readings for the first several days.

Why the VS920 reports the wrong battery percentage after a cell swap

The LG Intuition uses a coulomb-counting fuel gauge IC that builds its model from the original cell's discharge curve over many cycles. When you swap in a new cell, that learned model no longer matches the new cell's chemistry signature. The IC keeps applying the old curve, so the reported percentage drifts — sometimes reading 50% when the phone is close to shutdown. One full discharge cycle from 100% to automatic shutoff, followed by a full charge, forces the IC to reset its reference points against the new cell. After that cycle, percentage accuracy stabilises.

Sudden shutdown at 20–30% remaining on the VS920

This is a voltage cliff symptom. When the modem fires up for a call or the screen hits peak brightness, current draw spikes sharply. If the cell cannot sustain voltage under that load — even at a reported 25% — the phone hits the BMS undervoltage floor and cuts off instantly. On a degraded original cell, internal resistance is too high to deliver the current. On a fresh replacement cell, this usually points back to a fuel gauge IC that has not yet recalibrated. Run one full discharge-charge cycle, then check whether shutoffs still occur below 3.4V under load.