That would be the thing to do. If it had been a couple days since the first flight, and no battery charge, it's a good possibility the battery is just dead.
LiPo batteries are more complicated than other types. Many things will lead to their early failure. You may want to look at some posts on how to treat them to get good service from them.
LiPo batteries are more complicated than other types. Many things will lead to their early failure. You may want to look at some posts on how to treat them to get good service from them.