I recently came across the Lenovo Duet Chromebook which comes with a good mediatek processor and has a wonderfully long battery life. Here are some specs:

Hardware: Convertible 2-in-1 tablet; magnetic fabric-wrapped kickstand; snap-on keyboard + touchpad; two-tone Ice Blue + Iron Gray color scheme.
Dimensions and weight: Tablet only: 239.8 x 159.8 x 7.35 mm, 450g; Tablet + Keyboard + Kickstand: 244.87 x 169.31 x 18.2 mm, 920g;
Keyboard: Lenovo Smile Key; 1.3mm key travel; 3mm key space,
Display: 10.1-inch Full HD (1920 x 1200) IPS LCD touchscreen display; 400 nits peak brightness
Chipset: MediaTek Helio P60T (12nm)
Memory: 4GB LPDDR4X + 64GB/128GB eMMC
OS: ChromeOS
Cameras: 8MP autofocus (main); 2MP fixed focus (front)
Connectivity: 2x2 WiFi 802.11 ac; Bluetooth 4.2
Battery: 7,000 mAh; includes 10W charger
Misc: Articulating kickstand - 135-degree free stop; accelerometer; support for USI universal stylus; dual stereo loudspeakers

the lenovo chromebook duet works so well for office work! i love the powerful mediatek processor used along with the chrome OS.