I use WiSyncPlus to manage battery life and data usage.
I don't need to have my data constantly synced, so I sync once per day when I charge my phone. Here's how I set up WiSyncPlus: disable APN, Wifi, and auto sync; turn on Wifi when charger is connected; force sync when a wifi connection is established; turn off wifi when charger is disconnected. I turn on Wifi or APN manually when I want to use a network application.
You could also make it sync your data periodically instead of constantly: disable auto sync and APN, and create a WiSyncPlus schedule tha turns on your APN, force syncs your data, and then turns off the APN once every two hours.
The program has many options.
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