NP03XL 43Wh 11.4V Li-polymer laptop battery

HP Envy X360 15 & Pavilion X360 13 battery

This 43Wh 11.4V Li-polymer pack replaces the original NP03XL cell in HP Envy X360 15-u series and Pavilion X360 13-a series convertibles. It uses Grade A four-cell construction rated for roughly 300 to 500 full charge cycles. The unit ships with two screwdrivers and a manual for immediate installation. Buyers needing a higher capacity pack for longer unplugged runtime cannot use this model.

Thermal and power behaviour in daily use

The battery operates at 11.4 volts and delivers 43 watt-hours without active cooling, so it adds no fan noise to the chassis. Built-in circuitry provides short-circuit, over-voltage, over-current and discharge protection during charging and heavy loads. The pack weighs about nine ounces and fits the existing bay without increasing system heat output. Users who require a 20V 85W AC adapter specification will find that detail absent from this battery.

Build quality and connector implications

The black Li-polymer housing meets CE, FCC and RoHS certification and uses the original NP03XL connector layout for a direct fit. Included screwdrivers simplify the bottom-case removal on compatible Envy and Pavilion X360 models. The four-cell design keeps the profile slim so the convertible hinge and 360-degree rotation remain unobstructed. Owners of laptops outside the listed HP part numbers 761230-005 and 760944-421 cannot use this replacement.