LGIP-580N LG GC900 Replacement Battery 3.7V 900mAh

LG GC900 / GT950 Series — 3.7V Li-ion Replacement Battery (LGIP-580N)

This is a 3.7V, 900mAh Li-ion cell replacing the LGIP-580N battery in the LG GC900, GC900e, GT950, GT505, and 18 additional models. It fits the same physical footprint and connector as the original. Capacity is 900mAh (3.33Wh), matching the stock specification.

• GC900 / GT950 platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell covers the full compatibility list without any modification to the battery contacts or housing.
• Bench tested on actual hardware: We cycled this cell on a GC900 unit and confirmed the BMS accepted the charge curve without tripping cutoff. The protection circuit responded correctly to over-discharge and over-current conditions at both the charge and discharge rails.
• Fuel gauge recalibration on first use: After installation, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before using the device normally. This gives the phone's coulomb counter a complete reference curve against the new cell — skipping this step is why most users see percentage jumps in the first few days.

Sudden shutdown at 20–30% on the GC900 after a cell swap

The GC900's fuel gauge IC uses a stored discharge curve from the original cell to predict remaining capacity. A new cell has a slightly different voltage-to-capacity profile, so the IC can misread voltage and trigger shutdown before the cell is actually empty. This shows up most often when the modem fires a high-current burst — screen-on during a call or data transfer. The fix is one complete discharge-charge cycle with no fast charge. After that cycle, the coulomb counter recalibrates and the early shutdown stops.

Phone not powering on after the replacement battery sat in storage

Li-ion cells self-discharge in storage. If the LGIP-580N replacement cell dropped below approximately 2.5V per cell while sitting unused, the BMS will lock out to prevent damage — and the phone will show no response at all when you press power. Connect the phone to a wall charger, not a PC USB port, and leave it for 20–30 minutes without pressing anything. The charge IC needs to push a trickle current through the locked-out BMS to bring cell voltage back above the recovery threshold. Once the charging indicator appears on screen, the BMS has re-initialised and normal charging resumes.