HP EliteBook 840 G3 Laptop Battery Replacement (CS03XL / 11.4V Series)

This HP 840 G3 battery is a reliable replacement designed to restore original performance and battery life for HP EliteBook 840 G3 series laptops. It is fully compatible with the CS03XL battery family commonly used across 840 G3 and related G3/G4 business ultrabooks. Built with high-quality lithium-ion cells, it delivers stable 11.4V output and consistent runtime for everyday tasks such as office work, browsing, and professional use. The battery is an internal slim type designed for ultrabook chassis and includes essential safety protections such as overcharge, over-discharge, and short circuit protection to ensure safe and long-lasting operation.