It’s powerful – one l, not two, despite the fact that full as a word on its own is spelt with two. The same goes for all other adjectives of the same type, such as careful, useful, helpful, successful, awful, dreadful, delightful, wonderful, faithful, etc.
There are also nouns of measurement formed with -ful: e.g., spoonful, cupful, mouthful, handful, armful and pocketful.
©2015 Baxter Publishing, Hilversum, The Netherlands
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Also don’t put , in front of etc. Et cetera is a Latin expression that means “and other things”, or “and so forth”. So, it has and in it already.