The roughly ten minutes the fully charged battery offers sufficient time for several play sessions, however there are circumstances, such as multiple dogs, when you might need more time.
It's a good idea to have an extra battery or more on hand.
Another option is to purchase higher capacity batteries. We do not sell these, they are physically larger and will not fit completely into the battery compartment, however they will work just fine. This article has specs on what to look for: What to Look for in a Compatible Larger Capacity Battery