It sounds like he just does this to all batteries that come in and he threw away your battery because he assumed could make a quick tiny sale that no one would say no to but then got emotionally defensive when he was unprepared to confront a no... You didn't do anything wrong and you didn't even need to be apologetic in any way.
Just because it's cheap doesn't mean you have to say yes. It's like feeling entitled to take advantage of someone because it's just a little bit of advantage taking.
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