Battery Life: 3:37
Cost Per Hour of Juice: $39.50 per hour
You might have heard of the Kurio 7 tablet, because it's targeted directly to families. This $149, Android-powered device lets you create multiple child profiles with ease, as well as restrict screen time and Web surfing. Parents can also choose to whitelist only the apps they want Junior to use. But what good is a kids' tablet if it runs out of gas in just 3 hours and 37 minutes? That works out to $39.50 per hour. The $199 Amazon Kindle Fire HD lasted 7:34 (or $26 per hour), and it has a parent-friendly FreeTime mode. And the $199 Fuhu Nabi 2 didn't conk out until 8:05 ($24.50 per hour).