About this replacement
Samsung Galaxy A01 SM-A015V — 3.85V Li-Polymer Replacement Battery (QL1695)
This is a 3.85V, 2900mAh (11.17Wh) Li-Polymer replacement battery for the Samsung Galaxy A01 (SM-A015V, SM-A015M/DS, and related variants). It replaces the original QL1695 cell when the factory battery can no longer hold a usable charge. Fits the slim battery bay without modification — same footprint at 71.30 x 57.55 x 4.20mm.
- Galaxy A01 series compatibility: The SM-A015V, SM-A015M/DS, and related A01 variants share the same battery connector pinout and BMS handshake protocol, which is why a single QL1695 cell covers this entire model cluster.
- Bench tested on actual hardware: We ran this cell in an SM-A015V and confirmed the BMS accepted the new cell without triggering a fault flag — charge current stepped up normally through trickle, CC, and CV phases.
- Fuel gauge recalibration after swap: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before fast-charge current is introduced into an uncalibrated cell.
Sudden shutdown at 20–30% on the Galaxy A01 after a cell swap
The Galaxy A01's fuel gauge IC stores the discharge curve of the original cell in its coulomb counter. When a new cell goes in, the counter is still calibrated to the old, degraded cell's curve — so it misreads remaining capacity. Under screen or modem load, the new cell's voltage drops faster than the IC expects, and the phone hits the low-voltage cutoff while the gauge still shows 20–30%. One full discharge cycle, draining to automatic shutdown and charging back to 100%, forces the IC to relearn the new curve. After that cycle, percentage readings stabilise.
USB fast charge not activating on the first cycle after replacement
The charge IC on the A01 runs a handshake with the BMS before stepping up to fast-charge current. On the very first charge cycle with a new cell, the BMS often returns a conservative response — the IC stays in standard 5V charging mode as a precaution. This is not a fault. Let the first cycle complete at standard rate, disconnect, then reconnect — the BMS handshake resolves on the second connection and fast charge activates normally. If it still does not step up, confirm the charger outputs at least 9V/1.67A and the cable supports USB-PD signalling.