MeiZu M5c BT710 Replacement Battery 3.8V 3000mAh

MeiZu M5c / M710M / M710H — 3.8V Li-Polymer Replacement Battery (BT710)

This is a 3000mAh (11.4Wh) 3.8V lithium-polymer cell sourced as a direct swap for the MeiZu M5c, M710M, and M710H smartphones. It replaces part number BT710 and fits the same internal cavity at 74.85 × 60.10 × 3.90mm. If your M5c no longer holds a charge or shuts off unexpectedly under load, this cell addresses the failed original.

• M5c, M710M, and M710H compatibility: All three variants share the same BT710 connector pinout, cell footprint, and BMS handshake — the charge IC reads the same NTC thermistor signal across all three board revisions, so one cell covers the full M710 line.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on an M5c board. The BMS accepted the cell without fault flags, the NTC reported within spec, and the charge IC transitioned from CC to CV phase at the correct voltage threshold.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state — preventing erratic percentage readings from the first charge onward.

Sudden shutdown at 20–30% on the M5c after a cell swap

The M5c's fuel gauge IC retains the discharge curve from the old degraded cell. When the new cell reaches a voltage point the IC maps to "20% remaining," actual cell voltage under modem and display load drops faster than the IC expects — the phone hits the hardware undervoltage cutoff before the OS can warn you. This is not a fault with the replacement cell. Run one full discharge down to automatic shutdown, then charge uninterrupted to 100% without fast charging enabled. After that single cycle, the coulomb counter resets against the new cell curve and the shutdown behaviour stops.

Phone will not power on after the BT710 sat in storage

Lithium-polymer cells self-discharge during storage. If the BT710 drops below approximately 2.5V per cell, the BMS enters lockout mode and blocks current flow to protect the cell from damage — the phone shows nothing when you press the power button. Connect the phone to a wall charger rated at 5V and leave it untouched for 15–20 minutes. The charge IC will trickle current into the cell at a reduced rate until voltage climbs above the BMS re-enable threshold, at which point normal charging resumes. Do not use a fast charger for this recovery step.