About this replacement
Navon Mizu V8 — 3.8V Li-Polymer Replacement Battery (1ICP4/62/73)
This 3.8V, 2100mAh Li-Polymer cell replaces the OEM battery in the Navon Mizu V8 smartphone. It matches the original part number 1ICP4/62/73 and fits the Mizu V8 directly. Capacity is 2100mAh (7.98Wh) — identical to the factory specification.
- Mizu V8 fitment: The Mizu V8 uses a slim Li-Polymer cell with a specific connector pinout and BMS handshake tied to the phone's charge IC. This replacement matches the physical dimensions (92.80 x 64.80 x 3.85mm) and electrical profile the phone expects at the battery management interface.
- Bench tested on actual hardware: We ran charge and discharge cycles through the full capacity range. The BMS responded correctly to charge termination signals, and the cell held voltage without drop across the discharge curve under simulated screen and modem load.
- First-cycle calibration tip: On first use after installation, disable fast charging for one complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — it prevents erratic percentage readings from the first charge onward.
Why the Mizu V8 reports wrong battery percentage after a cell swap
The Mizu V8 uses a fuel gauge IC that builds its capacity model from charge and discharge history. When a new cell goes in, that stored model no longer matches the new cell's actual voltage curve. The phone reads voltage and translates it to a percentage using the old curve — so it reports 40% when the cell is closer to 15%. One full discharge to automatic shutdown followed by a complete charge resets the coulomb counter and lets the IC recalibrate against the replacement cell.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage collapses under peak load — typically when the modem transmits or the screen brightness spikes — even though the reported percentage looks safe. A Li-Polymer cell at the low end of its charge cannot sustain voltage under high-current draw, and the phone's protection circuit cuts power before the OS can react. The fix is the same recalibration cycle: discharge fully until the phone shuts itself off, then charge uninterrupted to 100%. After one full cycle the fuel gauge IC tracks the voltage cliff accurately and the shutdowns stop.