About this replacement
ZTE G6 — 3.7V Li-ion Replacement Battery (LI3707T42H3h463548)
This is a 3.7V, 650mAh Li-ion cell replacing the original battery in the ZTE G6 smartphone. It fits directly into the G6's battery bay and connects to the same BMS contacts as the factory unit. Use the capacity figure from the product data — 650mAh — as the baseline for any charge cycle expectations.
- ZTE G6 fitment: The G6 uses a compact 45.77 × 35.10 × 4.32mm cell with a single-cell Li-ion configuration at 3.7V nominal. The BMS on this phone monitors cell voltage directly — any replacement must sit within that voltage window or the phone will refuse to boot.
- Bench tested on actual hardware: We cycled this cell through full discharge and charge sequences, confirming the BMS handshake completes on power-up and the charge IC accepts the cell without triggering an error state. Voltage held stable across the G6's typical load draw from screen and modem activity.
- Fuel gauge recalibration on first use: After installation, disable any fast-charge mode and run one complete discharge-to-charge cycle at standard current. This gives the fuel gauge IC a clean discharge curve to map against the new cell before it starts making percentage calculations.
Why the ZTE G6 reports wrong battery percentage after a cell swap
The G6 uses a fuel gauge IC that builds its percentage model from the discharge curve of the cell it has been tracking. When you swap in a new cell, that learned curve no longer matches. The IC keeps using its old reference data, so the percentage shown on screen drifts from the actual cell state. One full discharge from 100% down to automatic shutdown, followed by a full charge, forces the IC to relearn the curve against the new cell. After that cycle, percentage accuracy normalises.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops below the modem or display load threshold before the fuel gauge reaches 0%. The G6's modem draw during a call or data session pulls enough current to cause a voltage sag — if the cell can't sustain voltage above roughly 3.2V under that load, the phone cuts out even though the reported percentage still looks healthy. It is not a faulty cell; it is the fuel gauge IC reporting a percentage based on charge remaining, not on the cell's ability to hold voltage under peak load. Run the full recalibration cycle first — one complete discharge and recharge — then retest under normal use before drawing any conclusions about cell quality.