Dual-core CPU + 13.3" Full HD screen + a tiny 48 Whr battery, lately seems to be a running theme for a lot of budget laptops. I personally bought the Yoga 720 for my young nephew in need of a new laptop for his school
Upon opening, wiped the storage, installed Win10-x64 and undervolted, before testing the battery life. 250 nits, windows' battery saver always on, all privacy settings disabled, most background programs and services manually disabled, advanced power settings all tweaked and CPU slightly underclocked, Wi-Fi AC and bluetooth on, 64-bit Google Chrome browser 20+ tabs, streaming 2 1080p content, speakers blazing at max volume.
Unfortunately this laptop only managed a disappointing a 4.5 hours, and consistently achieved around 5 hours for the next 5 days, before having returned it along with 3 other budget 13" laptops I'd considered (all from different ODMs). Only the Asus Zenbook UX360UA with the biggest battery, and somehow the lowest power draw, could last 8 hours in my test and 9 hours of regular usage, hence I gave to my nephew. It's worth mentioning that the Zenbook was also the cheapest out of all 5 without any applied discounts.
It seems like a decent laptop, with the inclusion of TB3 and PCIe SSD unlike the Zenbook, but very few people actually need those. More essential aspects however, such as incredible lack of battery life, practically unusable speakers, lack of USB 3 type-A ports, and frequently loud fans were deal breakers. Though I didn't experience any low multi-core performance on my unit.