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Hackaday has some theories: https://hackaday.com/2018/10/07/banksys-barely-believable-batteries/ https://hackaday.com/2018/10/07/banksys-barely-believable-ba..

Hackaday has some theories: https://hackaday.com/2018/10/07/banksys-barely-believable-batteries/ https://hackaday.com/2018/10/07/banksys-barely-believable-ba...