New Fitbit

I switched from a Fitbit one to a Fitbit Charge HR last summer after I lost my Fitbit One.  I liked some of the features on the Charge HR but missed the battery life of the One.  The Charge is supposed to be able to go something like 5 days on a charge but I usually had to charge it after 2 or 3.  Recently my Charge HR started to fall apart and I called Fitbit and they gave me the option of a replacement or 30% towards a new tracker.  I decided to upgrade to a Charge 2 and am anxious to see if I can get better battery life out of the new one.  The Charge 2 also replaceable wrist bands so I am looking for something besides the stock band that it came with.