It was never a real issue for me in any of the Lumias I owned. The first couple of charges can take a while and go fast, but after that, they seem to be pretty decent.
My current Red one has 41% remaining after it was fully charged, 10 hours ago with what I consider moderate usage. Here's the breakdown for the day:
- Over 90% of the time on 3G/LTE
- 4 phone calls, about 30 minutes total
- 30 minutes of radio streaming (ESPN app) over 3G/LTE
- About 10 minutes browsing (3G/LTE)
- A couple of speedtests (LTE)
- Amazing weather live tile updated hourly
- Downloaded a couple of small apps (LTE)
- Checking emails several times a day (two exchange accounts pushing email)
- Used a few other apps over 3G/LTE (MeTweets, LinkedIn, ESPN ScoreCenter)
I'm very satisfied, considering this is the very first charge. I'm also doing some experiments with this phone to see if it will "die on its sleep" like a few other Lumias I tried. I think I will start a topic to talk about that.