Keep compatible GXT4 UPS systems ready for the next outage with the Vertiv GXT4-144VBATKIT internal battery kit. Built for the GXT4-5000RT208 and GXT4-6000RT208, this 144 V lead-acid battery assembly helps restore the runtime your UPS needs to support servers, storage, and network equipment through power disturbances. Battery wear is one of the most common causes of reduced UPS performance. As batteries age, runtime drops and the margin for graceful shutdown narrows. This hot-swap internal battery kit gives infrastructure teams a practical way to refresh the energy storage inside the UPS without replacing the entire unit, helping control lifecycle cost while maintaining protection for critical loads. The 9 Ah battery capacity and spill-proof lead-acid construction are suited to enterprise environments that value predictable serviceability. With a 2-year limited warranty and compatibility with higher-capacity GXT4 models, this kit is a focused replacement option for sites that need dependable backup power and a clean maintenance path.