I will say in my personal testing, I found that the Galaxy's charge time was the longest of any of the different tablets I used. We do have several threads on saving battery, but basically, turn on Auto-brightness, turn on Airplane Mode and then only turn on the Network access type you need (WiFi or 3g/4g depending on device type), and only use BT if you need it.
Other than that, battery and power management is MUCH improved in Honeycomb compared to Gingerbread and Froyo.