BOOT: The Rusty Rescue: Book 2 by Shane Hegarty

Toy robot Boot has come a long way since it woke up in a scrapyard with only two-and-a-half glitchy memories. It has a home with its robot pals in an abandoned amusement arcade, and has discovered what true happiness is – although, it’s still not sure why humans are so leaky and weird. But when Boot and the gang stumble upon Rusty, an old, broken robot, forgotten in the back of a testing lab, it’s time to spring into action. Boot knows there’s something special about Rusty, but can they free the old robot and help it find its purpose?