Asus ZenFone 3 C11P1511 Replacement Battery 3.85V 2900mAh

Asus ZenFone 3 / ZS570KL / ZE552KL — 3.85V Li-Polymer Replacement Battery (C11P1511)

This is a 3.85V, 2900mAh Li-Polymer replacement cell for the Asus ZenFone 3 series smartphones. It fits the ZenFone 3, ZenFone 3 Deluxe Dual SIM Global, ZS570KL, and ZE552KL, among other variants in the same lineup. OEM part numbers C11P1511 and 0B200-02000500 both cross to this cell.

• ZenFone 3 series fit: These models share a common 3.85V cell format, connector pinout, and BMS handshake protocol. The ZS570KL and ZE552KL use the same physical envelope and charge IC communication — one cell covers the full range without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ZE552KL. The BMS accepted the cell without error flags, and the charge IC held steady at the correct termination voltage across multiple cycles.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one complete discharge-charge cycle on standard charge. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points — skipping this step is the leading cause of erratic percentage readings post-swap.

Sudden shutdown at 20–30% on the ZenFone 3 after a cell swap

This happens when the fuel gauge IC is still referencing the old cell's voltage-to-capacity curve. A fresh Li-Polymer cell hits a steeper voltage drop under modem or display load than the worn original — the phone interprets that as a hard cutoff even though capacity remains. The fix is one full, uninterrupted discharge to automatic shutdown followed by a full charge on standard (non-fast) mode. After that cycle, the coulomb counter recalibrates and the shutdowns stop.

USB fast charge not activating on the first cycle after replacement

On the first charge after a cell swap, the ZenFone 3's charge IC defaults to a reduced current trickle while it verifies the new cell's internal impedance. This is normal — the IC won't negotiate fast charge until it confirms the cell is stable above 3.0V per cell. If fast charge still does not activate after the first full cycle, check that the charger is rated for the correct protocol and that the USB cable is not limiting current. Try a known-good cable rated to at least 3A.