Asus ZenFone V Compatible Battery C11P1616 3.85V 2900mAh

Asus ZenFone V / V520KL — 3.85V Li-Polymer Replacement Battery (C11P1616)

This 3.85V, 2900mAh (11.17Wh) Li-Polymer cell replaces the original C11P1616 battery in the Asus ZenFone V (V520KL / A006). It fits directly into the battery bay and connects to the same BMS handshake points used by the factory cell. If your ZenFone V shuts down unexpectedly, drains fast, or no longer holds a charge, this is the direct cell swap.

• ZenFone V / V520KL / A006 fitment: All three model designations share the same battery bay geometry, connector pinout, and BMS communication protocol — one cell covers all variants. The 71.74 × 61.85 × 3.96mm dimensions match the factory housing with no modification needed.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles on the V520KL platform. The BMS accepted the cell without fault flags, the charge IC stepped through trickle, CC, and CV phases cleanly, and the fuel gauge IC did not report capacity mismatch errors after a full calibration cycle.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC on the ZenFone V is calibrated to the discharge curve of the original cell — running one slow cycle lets it map the new cell's curve before high-current fast charging pushes current into an uncalibrated state.

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

This happens because the fuel gauge IC still holds the discharge curve of the degraded original cell. When the new cell reaches a voltage region that the old curve mapped to 20–30%, the gauge triggers a low-voltage shutdown even though actual capacity remains. The fix is one full uninterrupted discharge to auto-off, followed by a slow charge to 100% with fast charging disabled. After that cycle, the coulomb counter resets its reference points against the new cell and the gauge reads accurately.

ZenFone V not powering on after sitting in storage

Li-Polymer cells enter BMS lockout when cell voltage drops below approximately 2.5V — a protection state the BMS uses to prevent unrecoverable cell damage. A phone that has been stored flat for months may sit in this state and show no response to the charge cable. Connect the phone to a wall adapter rated at least 5V/1A and leave it for 20–30 minutes without pressing the power button — the charge IC performs a trickle pre-charge phase that brings the cell back above the BMS unlock threshold. Once the screen shows a charge icon, the BMS has exited lockout and normal charging resumes. If no charge icon appears after 30 minutes on the wall adapter, check the cable and adapter with a known-good device first.