Infinix Zero 3 BL-30iX Replacement Battery 3.85V 3000mAh

Infinix Zero 3 X552 — 3.85V Li-Polymer Replacement Battery (BL-30iX)

This is a 3000mAh Li-Polymer cell at 3.85V (11.55Wh) for the Infinix Zero 3 (X552) smartphone. It replaces the original BL-30iX when the installed cell no longer holds charge through a normal day. Dimensions are 77.40 × 64.80 × 3.80mm — measure your bay before ordering if your unit has been repaired before.

• Zero 3 / X552 fitment: Both model designations refer to the same hardware revision. They share an identical battery bay geometry, connector pitch, and BMS handshake protocol — one cell covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Zero 3 platform. The BMS accepted the cell without rejection flags, and the charge IC stepped through CC/CV phases cleanly to a full 3000mAh acceptance.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the replacement cell

A new Li-Polymer cell has a slightly different voltage-versus-capacity curve than the aged cell it replaces. The fuel gauge IC still uses the old cell's curve as its reference. When the phone hits a load spike — modem switching bands, screen at full brightness — the actual cell voltage drops below the IC's shutdown threshold even though the displayed percentage reads 20–30%. The fix is one full unconstrained discharge down to auto-off, then a full uninterrupted charge. After that cycle, the coulomb counter resets its reference to the new cell and the reported percentage tracks accurately.

Device won't power on after sitting in storage

Li-Polymer cells self-discharge at roughly 2–3% per month. A replacement cell stored in a warehouse for an extended period can fall below 2.5V per cell — the threshold at which the BMS locks out to prevent damage. The phone will show no charging animation and will not respond to the power button. Connect a known-good charger and leave it undisturbed for 15–20 minutes; the charge IC trickle-charges the cell from the locked-out state until the BMS re-enables at approximately 3.0V, at which point normal charging resumes.