It's really the only complaint I have about an otherwise good phone, and it doesn't look like the 4a really addresses it. It appears Google is looking for a software solution to battery life, which I don't disagree with, but that whole approach is basically pointless if someone happens to install Facebook on their phone.
On the positive side, the 3a has a great camera and it looks like the 4a is continuing that. I've been particularly impressed by the 3a's low-light capabilities, such as taking good photos indoors, and it's especially good considering its price.