The educational robot kit with the longest battery runtime is the Husarion ROSbot XL, with a runtime of 6 hours. Its rated payload is 10 kg, and its battery capacity is 86 Wh. husarion.com +2husarion.com ↗“robot.payload_kg=10 kg”husarion.com ↗“robot.battery_runtime_h=6 h”husarion.com ↗“robot.battery_capacity_wh=86”
For context, this ranking covers the Educational & Research Robot Kits category, where 11 of the 56 products list a battery runtime. The ROSbot XL is a ROS 2-native indoor mobile robot platform configurable with an NVIDIA Jetson Orin Nano (8GB RAM) as its user computer. husarion.comhusarion.com ↗“ROS 2-native indoor mobile robot platform”
One note on scope: only products that list a battery runtime were ranked — 45 kits in this category have no runtime value stated in the catalog, so I can't compare against those. The runner-up among rated kits is the Clearpath Jackal at 4 hours. clearpathr...clearpathrobotics.com ↗“robot.battery_runtime_h=4 h”