ZTE Lutea Li3713T42P3h444865 Compatible Battery 3.7V 1300mAh

BASE Lutea — 3.7V Li-ion Replacement Battery (Li3713T42P3h444865)

This is a 3.7V, 1300mAh Li-ion cell built to fit the ZTE Lutea smartphone, sold under the BASE network brand. It slots into the original battery bay and connects to the same charging IC the phone shipped with. Capacity matches the OEM spec at 4.81Wh.

• Lutea platform fit: The Lutea uses a compact 43.50 × 47.00 × 6.10mm cell with a low 3.7V nominal rail. Both part numbers — Li3713T42P3h444865 and Li3712T42P3h444865 — cover this footprint. The BMS handshake runs at standard Li-ion thresholds, so the charge IC accepts the new cell without firmware flags.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS held the 4.2V charge ceiling and triggered the low-voltage cutoff cleanly above 3.0V. The protection circuit tripped at the correct threshold under load without nuisance cutoffs.
• Fuel gauge recalibration after install: On first use after fitting this cell, disable fast charging and let the phone run one full discharge-to-charge cycle. The Lutea's fuel gauge IC is calibrated to the old cell's discharge curve — one complete cycle lets it map the new cell before high-current charging begins on an uncalibrated coulomb counter.

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

This is a voltage cliff, not a faulty cell. The fuel gauge IC still holds calibration data from the old degraded cell and misjudges how much charge the new cell holds at mid-range. Under modem or screen load, the new cell's voltage drops faster than the IC predicts, and the BMS cuts power to protect the cell before the gauge hits zero. Running one full discharge cycle — draining to automatic shutdown, then charging uninterrupted to 100% — gives the coulomb counter enough data to remap its curve. After that cycle, the reported percentage tracks real charge state accurately.

Phone not powering on after the replacement battery sat in storage

If the cell self-discharged below 2.5V during storage, the BMS enters lockout mode and blocks current flow to prevent cell damage. The phone won't respond to a short press or show a charging indicator immediately. Connect to a wall charger — not a USB port — and leave it for 15–20 minutes without pressing anything. The charge IC trickle-charges the cell back above the BMS re-enable threshold of approximately 2.8–3.0V, at which point the protection circuit releases and normal charging resumes.