KingSener C31N1811 50WH 11.55V laptop battery

Replacement Battery for ASUS Zenbook 14

The KingSener C31N1811 is a 50WH lithium-ion battery built for ASUS Zenbook 14 models including UX433FN, UX433FA, UX433FX, BX433FN, RX433FN, Deluxe13, Deluxe14 and U4300F. It matches the original 11.55V specification and physical dimensions so installation requires no adaptation. The pack uses grade-A cells and a protected PCB that delivers the full design capacity without inflation.

Sustained Discharge and Cell Stability

Under continuous load the battery maintains stable voltage output thanks to its high-quality Li-ion cells and integrated protection circuit. The supplier confirms the full charge capacity is not less than the rated 50WH, so runtime remains consistent across repeated cycles rather than dropping after a few heavy sessions. Proper conditioning — two or three full charge and discharge sequences at low current — helps the cells settle to their true capacity.

Upgrade From Degraded Original Packs

This unit replaces an ageing or swollen factory battery that no longer holds a useful charge. The jump is worth it when the original cell health has fallen below 80 percent or when the laptop shuts down unexpectedly under moderate workloads. It is not for users who need a higher-capacity design than 50WH or who require a different voltage platform for another laptop series.