I want to buy a used Smarthphone and I do not know if I should opt for the Huawei Mate 10 lite, the Gigaset GS270 Plus, or the Motorola moto g6 Play.
For me, just the battery life is important.
I would be for Huawei Mate 10 lite.
I personally think this phone is great!
Then compare the three phones and inquire on the internet how good their battery life is.
What would your budget be? If battery life is important to you, take a look at the Xiaomi Mi A2 Lite. That has a really thick battery and could possibly even new for you in question.