BL-49KH LG Optimus LTE Replacement Battery 3.7V 1600mAh

LG Optimus LTE / Nitro HD — 3.7V Li-ion Replacement Battery (BL-49KH)

This is a 3.7V, 1600mAh Li-ion replacement cell for the LG Optimus LTE, LU6200, SU640, and Nitro HD smartphones. It replaces OEM part number BL-49KH directly. Fit this battery when the original cell no longer holds a useful charge or the phone shuts down unexpectedly under normal use.

• Optimus LTE and Nitro HD platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Optimus LTE platform and confirmed the BMS accepted the new cell without throwing a battery error flag or capping charge current.
• Fuel gauge recalibration on first use: On first installation, disable fast charging if available and run one full discharge-to-charge cycle. This allows the fuel gauge IC to map the new cell's discharge curve before reporting accurate percentages to the OS.

Sudden shutdown at 20–30% on the BL-49KH replacement cell

This is a voltage cliff issue, not a capacity fault. When the modem transmits or the screen peaks, current draw spikes sharply. An aged or freshly installed cell with an uncalibrated fuel gauge may report 25% remaining while actual cell voltage has already dropped below the BMS cutoff threshold — roughly 3.2V under load. The BMS trips the cutoff to protect the cell, and the phone powers off instantly. One full discharge-charge cycle recalibrates the coulomb counter and resolves most cases of this behaviour.

Phone won't power on after the replacement cell sat in storage

Li-ion cells self-discharge at roughly 2–3% per month in storage. If the cell voltage dropped below 2.5V per cell before installation, the BMS enters lockout mode and blocks charging to prevent thermal runaway on a deeply discharged cell. The phone will show no response — no charging indicator, no boot. Connect the phone to a wall adapter rather than a USB port; wall adapters deliver stable 5V at higher current, which gives the BMS enough headroom to exit lockout and begin a slow pre-charge recovery cycle. Leave it connected for at least 30 minutes before attempting to power on.