About this replacement
LG VN220 / Exalt LTE 4G — 3.8V Li-ion Replacement Battery (BL-49H1H)
This is a 3.8V, 1200mAh Li-ion replacement battery for the LG VN220, UN220, Exalt LTE 4G, and Classic Flip. It replaces OEM part numbers BL-49H1H and EAC63438202. If your original cell no longer holds a charge or shuts down unexpectedly, this is the direct swap.
- VN220 / UN220 / Exalt LTE 4G platform fit: These models share the same battery bay dimensions (58.45 × 37.80 × 5.40mm), connector pinout, and BMS handshake protocol — one cell covers the full range without modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on a VN220 unit. The BMS accepted the cell on first insertion, charge IC stepped through trickle, CC, and CV phases without fault, and the fuel gauge IC read stable voltage throughout.
- Fuel gauge recalibration on first cycle: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. The fuel gauge IC on the VN220 is calibrated to the old cell's discharge curve — this single cycle lets it recalibrate against the new cell before high-current charging begins.
Why the VN220 reports wrong battery percentage after a cell swap
The VN220 uses a coulomb counter in its fuel gauge IC that tracks charge based on the original cell's internal resistance and discharge curve. A new cell has different impedance characteristics, so the stored model no longer matches real-world voltage readings. The gauge will show inaccurate percentages — sometimes jumping 10–15 points — until it builds a new internal model. One full discharge down to auto-shutdown, followed by a complete charge to 100%, resets the coulomb counter and aligns the gauge to the new cell.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC's cutoff threshold doesn't match the new cell's actual voltage cliff. Under modem load or screen-on draw, cell voltage drops faster than the gauge predicts, triggering a hard shutdown before the displayed percentage hits zero. It is not a faulty battery — it is an uncalibrated gauge reacting to a real voltage sag. Run two full discharge-charge cycles at standard rate; after the second cycle, the gauge recalibrates its endpoint and shutdowns typically stop occurring above 10%.