RIM has denied that its Playbook tablet has poor battery life. The denial follows a note by Kaufman Bros analyst Shaw Wu which claimed the tablet’s battery only lasted a few hours. Wu added that the battery problem has led to RIM delaying the Playbook’s launch. The tablet is due to launch early in 2011. The company responds that Wu’s claim is based on using a pre-production model of the Playbook. Other tablets such as Samsung’s Galaxy Tab and Apple’s iPad have battery lives of six and ten hours, respectively.