Motorola Moto G7 JG30 Replacement Battery 3.85V 2900mAh

Motorola Moto G7 / XT1962 Series — 3.85V Li-Polymer Replacement Battery (JG30)

This is a 3.85V, 2900mAh Li-Polymer replacement battery for the Motorola Moto G7. It fits the XT1962-1, XT1962-4, XT1962-5, and related XT1962 variants. Capacity is 11.17Wh, matching the original JG30 specification.

• XT1962 variant coverage: The XT1962 lineup shares a common battery bay, connector pinout, and BMS handshake across regional variants. One cell fits all listed models without hardware modification.
• Bench tested on actual hardware: We ran this cell through a full charge cycle on an XT1962-4. The charge IC accepted the BMS handshake without errors, and current delivery stepped down correctly at the top-of-charge threshold.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on the Moto G7 after a cell swap

The Moto G7's fuel gauge IC retains the discharge curve of the old, degraded cell after a swap. When the new cell hits a voltage point the IC associates with near-empty on the old curve, it triggers an emergency shutdown — even though the cell still has usable charge. The fix is one full discharge-to-shutdown followed by an uninterrupted charge to 100%. After that cycle, the coulomb counter resets against the new cell's actual curve and the premature shutdowns stop.

USB-PD fast charge not recognised on first cycle after battery replacement

On the first charge after a cell swap, the Moto G7 may fall back to standard 5V charging instead of engaging fast charge. The charge IC performs a BMS negotiation at power-on — if the new cell's state-of-charge registers outside the expected window, the IC defaults to a conservative charge profile. Complete one full standard-rate charge cycle first. Fast charge will re-engage on subsequent cycles once the IC confirms cell health from the initial charge data.