ZTE V8000 Replacement Battery LI3719T42P3h644161 3.7V

ZTE V8000 / Nova 4.0 / N8000 — 3.7V Li-ion Replacement Battery (LI3719T42P3h644161)

This is a 3.7V, 1850mAh (6.85Wh) Li-ion cell for the ZTE V8000 and its platform siblings — the Nova 4.0, N8000, and Engage LT. It matches OEM part numbers LI3719T42P3h644161 and Li3717T42P3h644161. Physical dimensions are 63.30 × 41.00 × 6.10mm, so it drops into the battery bay without modification.

• V8000 platform compatibility: The V8000, Nova 4.0, N8000, and Engage LT share the same battery bay geometry, connector pinout, and BMS handshake voltage — that is why one cell covers all of them. No adapter or wiring change is needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the V8000 platform. The BMS accepted the cell without fault codes, the charge IC ramped normally from trickle to constant-current phase, and the protection circuit tripped cleanly at the expected low-voltage cutoff.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the ZTE V8000 after a cell swap

The V8000's fuel gauge IC was calibrated to the discharge curve of the original, degraded cell. When a fresh cell is installed, the stored curve no longer matches real voltage behavior. Under modem or screen load, the cell hits a voltage cliff the gauge did not predict, and the phone cuts power to protect the new cell. One complete discharge cycle — down to auto-shutoff, then a full charge — rewrites the coulomb counter to the new cell's curve. After that cycle, the shutdowns stop.

ZTE V8000 not powering on after the replacement battery sat in storage

Li-ion cells ship partially charged and lose charge in storage. If the cell dropped below roughly 2.5V, the BMS enters lockout mode to prevent damage from over-discharge — and the phone will not respond to a normal power press. Connect the phone to a wall charger, not a USB port, and leave it for 20–30 minutes without attempting to power on. The charge IC delivers a trickle current that slowly raises the cell voltage back above the BMS recovery threshold, typically around 2.9V, at which point the BMS releases and normal charging resumes.