Touch Bar MacBook Pro models have non-upgradeable SSDs, seemingly under-sized batteries - 9to5Mac
Amazon.com: E-YIIVIIL New Replacement Battery A1819 Compatible with Apple MacBook Pro 13' Touch Bar A1706 Late 2016 MLH12LL/A MPXV2LL/A Mid 2017
MacBook Pro 13-inch 2016 Touch Bar – Performance, screen, battery life Review | Trusted Reviews
A1820 Battery for MacBook Pro 15" Retina A1707 Late 2016-2017
SSD in the new MacBook Pro with Touch Bar can't be upgraded
661-06378 Silver Grey For Macbook Pro 15" A1707 Topcase W/ Keyboard Us English Trackpad Touch Bar Battery A1820 2016 2017 Year - Replacement Keyboards - AliExpress
How to Upgrade/Replace the Battery in a MacBook Pro 15-inch (late 2016 - mid 2017) - YouTube