how long does the battery last before replacing?
My harmony 900 Logitech is about 2 1/2 years old and at times it won't turn off the TV or turn it on and then if you wait awhile it does it.
I find its a tough question to answer. So many reviews from angry customers complaining about recharging theirs every couple of days.
Personally with mine, (700) mine has lasted nearly a month! Bought it just before Xmas, and its still on the same charge now (Jan 16tth). And it is used relatively heavily.
From what i gather, once it gives you the low battery warning, it will still last you the rest of the night. Then you just plug it in when you go to sleep. No big deal really!