[mort96]

1) A huge amount of wireless devices have these annoying low battery warnings which make the last 20 minutes a terrible user experience, you'd probably go through a whole lot of headphones/earbuds before you'd find one which doesn't. (And good wireless headphones and earbuds are typically significantly more expensive than $50)

2) There are many factors which go into how good earbuds/headphones are. While incredibly annoying and unnecessary, the quality of the "low battery" warning's implementation is realistically gonna be very low on the list of priorities for pretty much anyone. It's likely that the overall best product (when considering audio quality, Bluetooth implementation quality, battery life, price, comfort, weight, extra features like water/sweat/dust proofing, etc etc) is gonna have an annoying "low battery" warning.