sounds like an M3 (Pro) based macbook to me. I’ve run generative image AIs and LLMs on an M1 mac mini and the Apple Silicon is already capable of such things, despite being two generations behind.
CUDA enabled gaming laptops would not reach 5h battery life. 2-3h is realistic under workloads. An external Li-Ion power bank could extend that time, e.g. using an USB-C connection for power supply.
I doubt you’ll find similar convenience in a CUDA dev board. Also I haven’t seen off the shelf integrated solutions with batteries from nVidia.
Third party vendors like SparkFun appear to offer battery kits for Jetson embedded devices.
What are your size restrictions, by the way?