LGIP-531A LG GB100 Compatible Battery 3.7V 800mAh Li-ion

LG GB100 Series — 3.7V Li-ion Replacement Battery (LGIP-531A)

This is a 3.7V, 800mAh Li-ion replacement battery for the LG GB100 and related models including the GB101, GB106, and GB110. It uses OEM part number LGIP-531A and slots directly into the same battery bay as the original cell. If your GB100 is shutting down unexpectedly or no longer holding a charge, this replaces the degraded cell.

• GB100 series compatibility: The GB100, GB101, GB106, and GB110 share the same battery bay geometry, connector pinout, and 3.7V nominal voltage rail. All confirmed models use the LGIP-531A form factor, so one cell covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through a full discharge-charge sequence and confirmed the BMS communicates correctly with the charge IC — no false full-charge cutoff and no low-voltage lockout triggered prematurely under standard load.
• Fuel gauge recalibration on first cycle: On first use after installation, run one complete discharge down to automatic power-off, then charge uninterrupted to 100%. The GB100's fuel gauge IC was calibrated to the old cell's discharge curve — skipping this step causes percentage readouts to drift or jump erratically from the first hour.

Sudden shutdown at 20–30% on the GB100 after cell replacement

The GB100 uses a simple fuel gauge IC that tracks remaining capacity against a stored discharge curve from the original cell. A new cell with a slightly different internal resistance profile hits a voltage cliff at a different state-of-charge than the old one. When the phone's modem fires up for a call or the screen peaks in brightness, the instantaneous current draw pulls cell voltage below the BMS cutoff threshold — even though the reported percentage looks safe. The fix is one full discharge-charge cycle without interruption, which forces the fuel gauge to map the new cell's actual voltage curve before it resumes percentage reporting.

GB100 not powering on after the replacement battery sat in storage

Li-ion cells self-discharge at roughly 1–3% per month in storage, and a cell stored for an extended period can drop below 2.5V per cell — the threshold where the BMS latches into protective lockout and refuses to output current. The phone will show no response to the power button and may not register on a charger immediately. Connect the phone to a wall charger rather than USB on a computer, leave it for 20–30 minutes undisturbed, and the charge IC will trickle current into the cell until it recovers past the 2.7V re-initialisation threshold. If the phone still shows no charge indicator after 30 minutes on a wall adapter, check the charger output is at least 5V 1A.