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branwen-
In normal use the left is slaved to the right. Somewhat surprisingly though I've just tested and each one can be independently connected to the phone via Bluetooth.
If you were only using one ear you could probably get nigh on 24 hours by charging one in the case and then switching when the other ran out.
aggi
I have some QCY QS2 that I got for £20 from AliExpress. Amazon appear to have similar models for £5-£10 more.
They're surprisingly good. Sound quality isn't amazing but it's not bad. Connection is very solid which impressed me. They can be used as a pair or just singly (not sure if it's a specific ear that can be used singly). Battery is about 4 hours although the case holds enough battery for a couple of extra charges.