Need help identifying my ecig battery

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I just bought a used Firefly battery. I can't find any identifying marks on it other than the word "Firefly". I need to know the model# so I can get the charging specs. It has a USB Passthrough port and the button lights up blue when I vape. It's 4 1/8th inches long.

The real question I am trying to answer is can it be charged from the top (where the tank goes) or only via USB?

Thanks!
 

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