Asus ZB555KL Replacement Battery 3.85V 3700mAh

Asus ZenFone Max M1 — 3.85V Li-Polymer Replacement Battery (0B200-02880000)

This 3.85V, 3700mAh (14.25Wh) Li-Polymer cell replaces the original battery in the Asus ZB555KL and ZenFone Max M1 series, including Dual SIM and TD-LTE variants. It matches OEM part numbers 0B200-02880000 and C11P1707. The cell fits the same 81.08 x 59.78 x 4.22mm envelope and uses the same connector as the factory unit.

• ZB555KL and ZenFone Max M1 compatibility: All variants in this lineup — standard, Dual SIM, and TD-LTE — share the same battery footprint, connector pinout, and BMS handshake protocol, which is why one cell covers the full range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on ZB555KL hardware. The BMS accepted charge current without tripping protection, and the fuel gauge IC picked up the new cell without throwing low-battery errors at full capacity.
• First cycle after installation: Disable fast charging for the first complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging begins — skipping this step can cause the percentage readout to drift by 10–15%.

Sudden shutdown at 20–30% on the ZenFone Max M1

This happens when the cell voltage drops below the modem's minimum threshold under combined screen and LTE load, even though the fuel gauge still shows charge remaining. The old cell's discharge curve was shallow enough to mask the cliff — a new, uncalibrated cell hits it hard. Run one full discharge to 0% shutdown, then charge uninterrupted to 100% without fast charge enabled. After that single cycle, the fuel gauge IC recalibrates its coulomb counter to the new cell and the cutoff behaviour normalises.

Phone won't power on after the replacement cell sat in storage

Li-Polymer cells self-discharge in storage, and if the replacement cell dropped below 2.5V per cell, the BMS enters lockout to prevent damage. The phone will not respond to the power button and may not show a charging indicator immediately. Connect the phone to a wall charger — not a USB port — and leave it for 20–30 minutes before attempting to power on. Once the BMS detects voltage above its recovery threshold (typically around 2.9V), it re-initialises and normal charging resumes.