Hmm. Looks like you have done mechanical damage it to it. Maybe broken an internal contact. Do check it with a volt metre before binning it though.
As they are non maintenance, the only thing to do is replace it !!!
If it shows 0V then a contact is fried..
I just can't see a battery going completely flat by sparking it on the frame. They just don't work like that.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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