I've bought quite a few of the cheaper earbuds from Aliexpress, and there are problems with the really low end ones that you should watch out for:
- left and right earbud need to first pair with each other on startup before pairing to your phone. Otherwise you get one side paired to your phone and the other side is just dangling
- lack of volume controls on many
Battery capacity was actually never a show stopper for me - some earbud charging cases are 550 mAh while others are 3500. But the 550 one would already be enough for a whole day's worth of use, so by the end of the day I could just charge the case all the same.
- left and right earbud need to first pair with each other on startup before pairing to your phone. Otherwise you get one side paired to your phone and the other side is just dangling
- lack of volume controls on many
Battery capacity was actually never a show stopper for me - some earbud charging cases are 550 mAh while others are 3500. But the 550 one would already be enough for a whole day's worth of use, so by the end of the day I could just charge the case all the same.