Restore battery-powered operation in compatible portable computers with a Battery Technology replacement battery keyed to the L17M4PH1 reference. This battery is intended for service situations where the installed unit is depleted, damaged, or no longer retains sufficient runtime. The L17M4PH1-BTI ordering code identifies the Battery Technology replacement version for that battery reference. Match the replacement against the label on the existing battery before installation. The battery reference is the primary compatibility checkpoint, but technicians should also inspect the device’s battery bay, electrical contacts, connector location, retention arrangement, and service instructions. Those checks help prevent selecting a battery intended for a different portable-computer platform that uses a similar-looking pack. This model is distinguished by its direct association with the L17M4PH1 battery designation rather than by a general laptop-battery category. That specificity matters during maintenance because battery packs can differ in mechanical fit, contact layout, electrical characteristics, and firmware interaction even when they share a similar exterior shape. Use the full ordering code when ordering the Battery Technology replacement, and retain the L17M4PH1 reference when comparing it with the battery removed from the system. Replace the battery with the computer powered down and follow the equipment manufacturer’s approved handling and installation procedure.