I've seen no difference in battery life with 3.18.0 on my Glo than with any other firmware version, but I always turn off wi-fi when I have finished using it.
The sync has changed since 3.16.0 though, in that it now runs in the background, so even if the status bar says sync complete, it could actually still be running. The only way to be sure sync is not running is to turn off wi-fi manually. The problem in 3.18.0 is that there is no way to be sure whether sync has actually finished, and turning off wi-fi will cancel the background sync without asking for confirmation.
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