With the handbrake left on. The Lenovo IdeaPad 720s-13ARR is a 13.3-inch notebook with a sleek, slim keyboard, a backlit keyboard and an NVMe SSD. Unfortunately, neither the processor nor the battery life lives up to expectations. Find out in this review how the 720s-13ARR fares in our tests.
https://www.notebookcheck.net/Lenovo-IdeaPad-720S-13ARR-Ryzen-7-2700U-RX-Vega-10-Laptop-Review.318604.0.html
It's pretty strange that the same laptop with 2700U has quite larger battery life than 2500U, maybe it's because improvements of firmware or driver? Since the 2500U version was tested five months ago.
The CPU-Z mainboard image shows the BIOS is dated 2017-12-17.
www.notebookcheck.net/Lenovo-IdeaPad-720S-13ARR-Ryzen-7-2700U-RX-Vega-10-Laptop-Review.318604.0.html#toc-performance
A new BIOS dated 2018-07-09 was released 2018-07-10 and described at this link.
www.reddit.com/r/Amd/comments/8yz7n8/lenovo_720s_new_bios_fixes_hard_throttling/
Apparently Lenovo Deutschland didn't provide a notebook with the updated BIOS.