FILE PHOTO: A lithium battery unit of the startup "sonnen", formerly known as Sonnenbatterie, is seen in Berlin, Germany, October 14, 2016. REUTERS/Axel Schmidt FRANKFURT : Sales of household power batteries in Germany may jump 67per cent in 2022 as residents employ energy-storage technology for a cheaper, renewable and more reliable supply of energy, industry association BVES said. "High energy prices and the quest for security of supply will give home storage batteries a further push in 2022," BVES said on Wednesday, presenting an industry-commissioned study undertaken by 3Energie Consulting.