BIG C
This is a shopping mall with a variety of products from supermarkets to individual stores.
Aeon in Japan.
You can buy souvenirs here, and if you want to buy everyday clothes, BIG C is recommended.
Thai people also use it, so you can buy regular clothes that aren't for tourists.
There's also a food court, so I'll probably go to BIG C for now. It's a place I go to just like that.
I also have electronics, so I would like a smartphone.
If you don't have a battery, just go here. There are batteries all over Thailand.