Olympia 2286 Replacement Battery 3.8V 2800mAh

Olympia 2286 / NEO — 3.8V Li-Polymer Replacement Battery (200869)

This 3.8V, 2800mAh Li-Polymer cell is a direct swap for the original battery in the Olympia 2286 and NEO smartphones. It restores power to the processor, display, and radio stack when the factory cell has degraded. Dimensions are 80.80 × 58.20 × 4.30mm — confirm these against your existing battery before installing.

• Olympia 2286 and NEO compatibility: Both models run the same 3.8V battery bay with an identical connector pinout and BMS handshake protocol, so a single cell covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the 2286 platform. The BMS accepted the cell without rejection flags, and the charge IC reached termination voltage cleanly at 4.35V.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes load into an uncalibrated cell — preventing erratic percentage readings from the first hour of use.

Sudden shutdown at 20–30% on the Olympia 2286

Li-Polymer cells have a steep voltage cliff near the low end of their discharge curve. When the modem fires a high-power transmission or the screen peaks brightness, it pulls a current spike the weakened cell can't sustain at that state of charge. The BMS trips the output to protect the cell — the phone dies even though the OS reported charge remaining. Running one full calibration cycle after fitting this replacement flattens that behaviour, because the fuel gauge IC learns where the actual voltage cliff sits on this cell's chemistry.

Phone won't power on after sitting in storage with a flat battery

If a Li-Polymer cell discharges below approximately 2.5V during storage, the BMS enters lockout mode to prevent charging a potentially unsafe cell. The phone shows nothing — no logo, no charge indicator — when you plug in. Use a charger that outputs a trickle precharge current rather than a fast-charge brick; this lets the charge IC slowly bring the cell above the 3.0V threshold where the BMS re-enables full charge current. Once the phone shows a charging indicator, let it reach at least 15% before powering it on.