About this replacement
OnePlus 3 / A3000 Series — 3.8V Li-Polymer Replacement Battery (BLP613)
This is a 3.8V, 3000mAh lithium-polymer cell for the OnePlus 3 and OnePlus 3 Dual SIM (models A3000 and A3003). It replaces the original BLP613 when the factory cell can no longer hold a charge or fails to charge at all. Capacity is rated at 11.4Wh and the cell dimensions are 82.00 × 62.50 × 3.90mm.
- A3000 and A3003 fit: Both variants share the same battery bay, connector pinout, and BMS handshake protocol. The BLP613 spec covers both — same voltage rail, same physical footprint, same thermistor line.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an A3000 unit. The BMS accepted the cell without error flags, the thermistor line read correctly, and the fuel gauge IC tracked state-of-charge without triggering a cutoff event.
- Fuel gauge recalibration on first use: After fitting this cell, disable Dash Charge and run one complete discharge-to-charge cycle at standard 5V charging. This gives the coulomb counter a clean baseline against the new cell's discharge curve before high-current charging begins on an uncalibrated gauge.
Sudden shutdown at 20–30% on a fresh BLP613 cell
This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The OnePlus 3 reads voltage-based state-of-charge, and a new cell has a slightly different voltage cliff at low charge levels. The phone sees what it thinks is a valid 25% charge, but the new cell's voltage drops below the modem or display load threshold before the gauge catches up. One full discharge to automatic power-off, followed by a complete charge, resets the coulomb counter and eliminates the false shutdown.
OS percentage jumping erratically after cell replacement
The fuel gauge IC on the OnePlus 3 stores learned capacity data from the previous cell in a register that is not cleared by powering off. After a cell swap, the old learned values no longer match the new cell's actual charge curve, so the reported percentage skips around. This is not a fault with the replacement cell — it is the gauge recalibrating in real time. Two complete discharge and charge cycles at standard voltage will stabilise the readings. If jumping continues after three cycles, check that the battery connector is fully seated at pin 4, the thermistor contact.