Is there a special operating mode that enables me to get 8 hours of battery operation in the TPS2000 Series?

No, there is no low-power setting as on some products because TPS2000 monitors the remaining battery life. With two fully charged batteries, the product can operate for up to 8 hours even with the front panel backlights operating. In addition, the battery discharge status and the time remaining are displayed in the Utility System Status menu. This provides information for efficient use of the hot-swappable battery feature.