About this replacement
OnePlus Nord CE 4 Lite 5G — 3.91V Li-Polymer Replacement Battery (BLPA69)
This is a 5350mAh Li-Polymer replacement battery for the OnePlus CPH2619, CPH2621, and Nord CE 4 Lite 5G. It slots into these models because all three share the same board layout, connector, and BMS handshake tied to the BLPA69 cell specification. Voltage is 3.91V nominal, matching the charge IC thresholds on all three variants.
- CPH2619, CPH2621, and Nord CE 4 Lite 5G fit: These three model numbers share a common mainboard revision. The power connector, BMS communication protocol, and physical cell dimensions are identical across all three — one cell covers the whole group without any hardware modification.
- Bench tested on actual hardware: We cycled this cell through a full charge and discharge on a Nord CE 4 Lite 5G. The BMS accepted the cell, reported state-of-charge correctly after one full cycle, and the charge IC held the 4.45V upper cutoff without deviation.
- First-cycle fast charge behaviour: After installation, disable SUPERVOOC or any fast charge mode for one complete discharge-charge cycle. The fuel gauge IC needs to map the new cell's discharge curve before high-current charging pushes amps into an uncalibrated cell — running slow charge first prevents early percentage errors.
Sudden shutdown at 20–30% on the Nord CE 4 Lite 5G
This is a voltage cliff issue, not a capacity issue. When the modem transmits or the screen peaks in brightness, the cell has to deliver a short burst of high current. An aged or freshly installed cell with an uncalibrated fuel gauge IC can drop below the 3.4V protection threshold under that load — the BMS trips and the phone cuts off even though the OS showed charge remaining. One full slow discharge-charge cycle lets the coulomb counter recalibrate against the actual cell curve. After that cycle, the OS percentage and the real cell state align, and the shutdowns stop.
Phone won't power on after sitting discharged in a drawer
Li-Polymer cells self-discharge at roughly 2–3% per month. A phone stored for several months can drop the cell below 2.5V per cell — the BMS hard-locks to prevent damage and the phone shows no response to the power button or cable. Connect to a wall adapter rated at least 10W and leave it for 20–30 minutes without pressing anything. The charge IC trickle-feeds current at around 100mA to bring the cell back above the 2.8V BMS re-enable threshold, after which normal charging resumes. If the screen still shows nothing after 45 minutes on the wall adapter, check the cable and adapter with a USB meter — a dead cable is the most common cause of failed recovery.