- Product Name: Shirotan Rechargeable Hot Water Bottle - How to Use: Easy to use in 2 steps - Heating Time: Approximately 15 minutes Thank you for viewing. This is a cute Shirotan rechargeable hot water bottle. It's a great help in winter as a warm hot water bottle! Besides that, it can be enjoyed year-round as a cute stuffed animal! I bought a spare, but I'm selling it to someone who wants it. I opened it once and took out Shirotan, but I didn't use it and put it away immediately. Please refrain from purchasing if you are looking for a perfect item or if you are nervous about the condition. *Shirotan was not wrapped in plastic from the time of purchase and was placed directly in the box.