A:Answer Hello, Robert! That's a great question! I can confirm that the HP Spectre 2-in-1 16"(16-f0023dx) does not have the ability to restrict the battery charge level. It does have the Adaptive Battery Optimizer which comes enabled automatically in the BIOS. Battery life will vary depending on various factors including model, configuration, loaded applications, features, use, wireless functionality, and power management settings. The maximum capacity of the battery will naturally decrease with time and usage. Thank you for your question!