Highest voltage from a potato battery

According to Official Guinness Records,

The highest voltage from a potato battery is 1,224 volts and was achieved by the Marie-Therese Gymnasium (Germany) in Erlangen, Germany, on 7 July 2012.

For a complete list of 2012 records, please visit 2012 Guinness Records in Germany.

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Other Germany records that might interest you:

• Largest collection of three-piece tea sets
• Longest marathon playing table football/foosball (team)
• Most bank notes removed from a wallet by a dog in one minute
• Most hot water bottles burst with the nose in one minute
• Fastest road run 25 kilometres (male)