Designed for use with the LEGO EV3 Intelligent Brick, this Lithium Ion rechargeable DC battery gives you an alternative to normal AA batteries. Capacity: 2050 mAH. Estimated recharge time 3 - 4 hours. Requires the (45517) LEGO Transformer 10V DC charger which is sold separately.
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Battery Pack
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I use these batteries in my middle school. They get lots of use and saves the environment since I'm not using 6 single use batteries each week per robot.
Honestly, there's nothing wrong with the product to truly merit a one star deduction. I just have a really big problem spending this much on a battery. Works great with the EV3, and gets you out of the business of buying AA batteries in bulk...or taking on a part time job as your child's "batter charger guy" (the pay is pretty horrible fyi). If your kids are into Lego robotics, you pretty much have no choice but to pick up one of these bad boys, unless one of the above options appeals to you.