ZDNET's key takeawaysThree in four battery owners saw their expectations exceeded. A recent home battery survey from independent research firm Habitelligence suggests other battery owners feel the same sense of satisfaction. The data shows that 91% of battery owners said they would buy again, and 71% said their system exceeded (not just met) expectations. For example, battery owners in Massachusetts who participate in its ConnectedSolutions program earn $1,200 per year on average, according to National Grid. While the Habitelligence survey found that 91% of battery owners would buy one again, the experience isn't the same for everyone.