Ok - what is it?

Illustration for article titled Ok - what is it?
Photo: Arthur Innhaus
Illustration for article titled Ok - what is it?
Photo: Arthur Innhaus
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Illustration for article titled Ok - what is it?
Photo: Arthur Innhaus
Illustration for article titled Ok - what is it?
Photo: Arthur Innhaus
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This arrived in a box of electronic junk I purchased. It feels heavy, like a battery. I’m guessing that it’s for a bicycle lighting system but I don’t recognize the brand or logo or connector type. Anybody know what I’ve got?

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