When you've found the perfect sex toy. flat batteries are the last thing you need. Now. you don't have to worry. These Super Heavy Duty batteries are ready to use for up to 3 years. They also have super. long-lasting power. so you can go on for as long as you like. As they're C2 batteries. they're some of the most powerful on the market. They're perfect for stimulating toys that need lots of power!