About this replacement
Lenovo A60 / A500 Series — 3.7V Li-ion Replacement Battery (BL171)
The BL171 is a 3.7V, 1450mAh Li-ion cell that fits the Lenovo A60, A65, A500, and A50 smartphones. It replaces the original internal battery when the existing cell has degraded or fails to hold a charge. Dimensions are 58.24 × 45.60 × 4.67mm — verify these against your existing cell before installation.
- A60 / A500 platform fit: These models share the same battery bay geometry, voltage rail, and connector pinout, which is why a single BL171 cell covers all variants listed. The BMS handshake on each device communicates over the same three-pin interface, so the fuel gauge IC picks up the new cell without a firmware conflict.
- Bench tested on actual hardware: We cycled this cell on an A60 unit and confirmed the BMS accepted the cell at first boot, the charge IC hit cutoff at 4.2V, and the fuel gauge began tracking capacity correctly after one full discharge-charge cycle.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The coulomb counter in the A60 is calibrated to the old cell's discharge curve. Running one full cycle at standard rate gives the IC accurate endpoints before high-current charging begins.
Why the A60 reports wrong battery percentage after a cell swap
The A60 uses a fuel gauge IC that stores a learned discharge curve from the original cell. When you install a new BL171, that stored curve no longer matches the new cell's actual voltage-to-capacity profile. The IC interpolates percentage from voltage readings against the old curve, so the displayed figure drifts — often reading higher than actual state of charge. One full discharge to automatic shutdown followed by a full charge corrects the learned curve and brings the percentage readout back in line.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff issue, not a capacity problem. Under modem or screen load, the new cell's terminal voltage drops faster than the fuel gauge IC predicts, tripping the low-voltage cutoff while the display still shows charge remaining. It happens most often in the first few cycles before the coulomb counter has accurate data on the new cell's internal resistance. Run two full discharge-charge cycles and the shutdowns typically stop. If they persist past cycle three, check that the cell voltage at shutdown is above 3.0V — anything lower points to a cell fault.