Buying a new budget phone

I think your requirements isvague. It is really hard to tell what battery capacity is good or bad. Such as, iPhone only has about 2500mAh, it is not good. But it still works fine. There are many China phones are suitable for you.

go for moto g4 or redmi note 3 as they are the best in this range and if you're brand conscious then go for samsung j7