LG VX8500 Replacement Battery 3.7V 700mAh Li-ion

LG VX8500 Chocolate 3 — 3.7V Li-ion Replacement Battery (LGLP-AGKM / SBPP0017001)

This 3.7V, 700mAh lithium-ion cell replaces the original battery in the LG VX8500, VX8500r, and Chocolate 3. It matches the OEM footprint at 56.97 × 43.76 × 5.61mm and slots into the same battery bay without modification. If the original cell is swelling, draining within hours, or failing to power on, this is the direct swap.

• VX8500 and Chocolate 3 fitment: These models share the same battery bay geometry, contact pin layout, and 3.7V nominal voltage rail — which is why a single cell covers all four variant SKUs including VX-8500 and VX8500r.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a VX8500 unit. The BMS accepted charge without fault codes, maintained stable voltage through call-load simulation, and held cutoff above 2.75V under sustained screen-on draw.
• Fuel gauge recalibration on first install: After fitting this cell, run one complete discharge down to auto-shutoff, then charge uninterrupted to 100% before resuming normal use. The VX8500's fuel gauge IC was calibrated to the old cell's discharge curve — skipping this step causes erratic percentage readings from the first hour.

Why the VX8500 reports wrong battery percentage after a cell swap

The VX8500 uses a coulomb-counting fuel gauge IC that builds its charge model from historical discharge data stored against the original cell. A new cell has a different internal resistance and discharge curve, so the IC's predictions fall out of sync immediately. You'll see the percentage jump, stall, or read 20% when the phone is actually near full. One full discharge-to-shutoff followed by an uninterrupted charge to 100% forces the IC to reset its learned curve against the new cell's actual behaviour.

Sudden shutdown at 15–25% on the replacement cell

This happens when the cell voltage drops sharply under load — a voltage cliff — faster than the fuel gauge predicted. The modem radio and display draw current spikes the 700mAh cell cannot sustain once capacity dips below the cliff point, so the BMS cuts power to protect the cell before the UI reaches 0%. It is not a fault with the replacement — it is the fuel gauge IC still running the old discharge model. After completing one full calibration cycle, the shutoff point shifts back to where it should be, typically below 5%.