Asus SBP-10 M530 Replacement Battery 3.7V 2200mAh

Asus M530 / M530w / Aries — 3.7V Li-ion Replacement Battery (SBP-10)

This is a 3.7V, 2200mAh Li-ion cell (SBP-10) for the Asus M530, M530w, and Aries smartphones. It replaces the original battery when the phone can no longer hold a charge or fails to power on. Capacity is rated at 8.14Wh and matches the OEM specification.

• M530, M530w, and Aries compatibility: These three models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The SBP-10 fits all three without modification — the BMS communicates over the same two-wire thermistor line used across the platform.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the M530 platform. The BMS accepted the cell without fault codes, the charge IC ramped to full current within the first cycle, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration after installation: On first use, disable fast charging if available and run one full discharge-to-charge cycle before normal use. The M530's fuel gauge IC is calibrated to the old cell's discharge curve — a single full cycle lets it map the new cell and report accurate percentages.

Why the M530 reports wrong battery percentage after a cell swap

The M530 uses a coulomb counter that tracks charge in and out relative to a learned discharge curve stored from the previous cell. When you install a new cell, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts — often showing full when it isn't, or dropping suddenly. This is not a fault with the replacement cell. One complete discharge from 100% down to automatic shutdown, followed by a full uninterrupted charge, resets the counter's reference points. After that cycle, percentage reporting stabilises.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still running the old cell's voltage-to-capacity curve. The new cell hits a steeper voltage cliff under load — modem transmission bursts and screen backlight together can pull the cell below the BMS cutoff threshold even though the gauge still reads 25%. The phone cuts out to protect the cell, not because the cell is faulty. Run one full calibration cycle as described above; if shutdown persists past that, check that the battery connector is fully seated — a partially seated connector raises contact resistance and accelerates the voltage sag under load.