Nokia 6.2 LC-620 Compatible Battery 3.85V 3400mAh

Nokia 6.2 — 3.85V Li-Polymer Replacement Battery (LC-620)

This is a 3.85V, 3400mAh lithium-polymer replacement battery for the Nokia 6.2 smartphone. It replaces OEM part LC-620, the original cell that powers the display, processor, modem, and all onboard functions. Order this when the existing cell no longer holds charge through a normal day or causes unexpected shutdowns.

• Nokia 6.2 fitment: The Nokia 6.2 uses the LC-620 cell format — 77.80 × 62.60 × 3.90mm with a specific connector pinout that carries battery ID and temperature data to the phone's power management IC. A mismatched cell triggers a battery warning or refuses to charge.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Nokia 6.2 platform. The BMS handshake completed without error flags, charge current ramped correctly through CC/CV phases, and the fuel gauge IC accepted the new cell without tripping a fault state.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one complete discharge down to auto-shutdown, then charge to 100% on standard current. This gives the fuel gauge IC a full reference curve for the new cell before high-current fast charging is applied to an uncalibrated state.

Why the Nokia 6.2 reports wrong battery percentage after a cell swap

The Nokia 6.2 uses a coulomb counter combined with a voltage-based fuel gauge IC. That IC builds its percentage model against the discharge curve of the original cell over hundreds of cycles. When a new cell goes in, the stored curve no longer matches the actual cell behaviour — so the reported percentage drifts from reality. The fix is one full uninterrupted discharge-to-shutdown followed by a full charge with the screen on, which forces the IC to re-map its curve against the new cell. After that single cycle, percentage reporting stabilises.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC has not yet recalibrated and the phone hits a voltage cliff — the cell voltage drops below the modem's or display's minimum rail before the gauge registers low charge. Under peak load, a fresh uncalibrated cell can sag from a reported 25% straight to the hardware cutoff voltage of around 3.2V. The phone interprets this as an emergency shutdown, not a low-battery event. Run the first-cycle recalibration process above and the cliff moves back to its correct position near 5–8%.