I suggest following the manufacturer's recommendations, which probably says plug it in and fully charge it. However, other battery Gurus on here might have better/other suggestions. Lots of folks now have very specific opinions on how to try to maximize the life of batteries, and some are saying that in general, one should try to keep the device between the 20% and 80% range. However, I don't know if that applies to first brand new charge. You should also be able to find various advice by googling it.