About this replacement
LG Stylo 5 — 3.85V Li-Polymer Replacement Battery (BL-T44)
This 3.85V, 3400mAh Li-Polymer battery replaces OEM part BL-T44 in the LG Stylo 5 and its carrier variants including LMQ720PS, LMQ720CS, and LMQ720MS. It fits the same physical footprint as the factory cell at 93.04 × 43.42 × 4.50mm. Install it when the original cell no longer holds a charge or causes unexpected shutdowns.
- Carrier variant compatibility: The LMQ720 series spans Sprint, Verizon, Metro, and T-Mobile hardware. All share the same battery bay dimensions, connector pinout, and BMS handshake protocol — this cell works across all those variants without modification.
- Bench tested on actual hardware: We ran this cell on a Stylo 5 unit through full charge and load cycles. The BMS accepted the charge profile without error, the protection circuit triggered correctly at low-voltage cutoff, and the fuel gauge IC initialised without flags on boot.
- First-cycle fast charge behaviour: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.
Why the Stylo 5 reports wrong battery percentage after a cell swap
The Stylo 5 uses a coulomb-counter fuel gauge IC that builds its charge model against the original cell's impedance and discharge curve over time. When a new cell goes in, the IC still references the old model. This causes the reported percentage to lag behind or jump ahead of actual charge state. One full discharge to automatic shutdown followed by an uninterrupted charge to 100% forces the IC to resample against the new cell and correct its internal table.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff, not a capacity problem. Under peak modem or screen load, the new cell briefly drops below the BMS cutoff threshold — typically around 3.2V — even though the reported percentage still shows charge remaining. The fuel gauge IC has not yet mapped where the cell's voltage collapses under load. Run two full discharge-charge cycles without fast charging. After recalibration, the IC anticipates the voltage drop earlier and the OS shuts down closer to 0% rather than 25%.