I think at this stage (we're small), you should try to keep it between 90 and 100... It will recharge 20% per day they say, but it seems to take longer the closer you get to 100%... I've brought mine up to 90 now, from under 5%, but it seems like I only get about 8-10 a day without knocking it down too far.

The other thing to remember is if you aren't going to be on it for a day or 2... In that case you can run it down further since, you won't be around to use it. When I go on vacation, I'm going to take it down to 1% :)

And one last thing, learning to be on here without upvotes as a crutch to be nice has forced me to make many more comments to people instead of using my upvote. That has resulted in major amount of likes on my comments, which is much better than any posts that I've made. So being low on Voting Power can be a good thing if you develop your comment skills to others (because they just might like what you said) !!!

Glad I could help, if you have any other questions, just let me know!