Battery Life
As I've mentioned earlier, the Moto G5 comes with a 2,800 mAh (10.8 Wh) removable battery, while the Moto G5 Plus features a 3,000 mAh (11.6 Wh) non-removable battery. While the Moto G5 Plus' battery is only seven percent larger than the Moto G5, it also packs a more efficient SoC built using a 14nm process, which should provide better battery life than the difference in capacities would suggest.
It's worth mentioning that the Moto G5 Plus is the only phone of the two to come with Motorola's TurboPower fast charger in the box, hence why the Moto G5 Plus significantly outperforms the Moto G5 in charge time. However, Motorola confirmed to me that both phones support TurboPower charging, so if you purchase a Moto G5 then buy a TurboPower charger separately, you'll get the same benefit.