The capacitor that wasn't

[saturated]

I dug this out of some dirt while weed eating and thought hey cool it's a capacitor

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Like maybe someone got mad at a TV when their kicker missed a field goal or tried to recreate Wendy O's flaming school bus through a wall of TVs 

But now it looks like a battery

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True story I have an elderly customer she had a Toyota hybrid SUV said it was a great car had it like 12 years but anyway it ended up getting totaled she was unhurt but told me about a hundred times she was so glad it didn't catch on fire like the big batteries or whatever.
Anyhow I believed her but it didn't really sink in I was like yeah ok yeah good thing 
About a month later I was mowing this guy's grass he's a young buck really good guy but a wild man I'm making a pass and hit something with my mower a loud thump it stops the engine I start cussing and pull it back....and there's a small fire   
So I'm trying to wrap my head around this wondering ok maybe the blade sparked and ignited the dry grass...yeah kind of a long shot but who knows .... meanwhile I see some strange debris where the fire 🔥 is 

About that time he runs out and says "oh wow you found my phone" and says him and his gf were fighting and drinking and she had thrown it out into the yard 

So I went back and told that lady wow now I know what you meant 

[J M Fahey]

It IS a batter.
Does it take charge?
Use a 12 V supply and charge this through a 50-100 ohm resistor.