yes, there is a number that recharges about 20% per day governing your voting power. Even if you don't have access to the slider for voting strength this is important, so while you don't have as much reason to be changing votes as someone with the slider that can change their vote strength it would still drain your voting power if you were to vote then unvote then vote again (for whatever reason), so just keep it in mind, especially for when you unlock the slider (about 500SP).