BoostMobile VENI Replacement Battery 3.7V 2400mAh

BoostMobile VENI / LG730 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 2400mAh Li-ion cell for the BoostMobile VENI and LG730 smartphones. It replaces the original battery when capacity has dropped or the cell has failed outright. Voltage and physical dimensions match the stock cell exactly: 64.85 × 43.26 × 10.50mm.

• VENI and LG730 compatibility: Both devices share the same battery bay dimensions, 3.7V nominal rail, and connector pinout — one cell covers both. The BMS handshake protocol is identical across this hardware revision.
• Bench tested on actual hardware: We cycled this cell through a full charge-discharge sequence and monitored BMS cutoff behaviour at low-voltage threshold. The protection circuit tripped correctly at the expected floor, with no false cutoffs under simulated screen-plus-modem load.
• Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge-charge cycle at standard rate. The fuel gauge IC on the VENI calibrates its coulomb counter against the cell's discharge curve — skipping this step on a new cell causes the percentage readout to drift mid-cycle.

Sudden shutdown at 20–30% on the BoostMobile VENI

This is a voltage cliff issue, not a capacity problem. When the modem fires for a call or the screen peaks brightness, current draw spikes sharply. A degraded or uncalibrated cell cannot hold voltage through that spike, and the phone's power management IC interprets the sag as an empty battery and cuts out. Replacing the cell removes the source of the sag, but the fuel gauge IC still needs one full cycle to map the new cell's discharge curve accurately. Until that cycle completes, shutdowns at apparent 20–30% can persist.

Phone reports wrong battery percentage after cell swap

The VENI's fuel gauge IC stores a learned discharge curve from the old cell in its coulomb counter. After swapping to a new cell, that stored curve no longer matches the actual chemistry — so the percentage shown is mapped against stale data. The fix is one uninterrupted discharge from 100% to auto-shutdown, followed by a full charge to 100%, with fast charging turned off. After that single cycle, the IC resets its reference points against the new cell and percentage accuracy stabilises.