The new Steam Controller's batteries are supposed to last dozens of hours per charge and comes with a charging puck. It doesn't take a genuis to figure out that you just charge it when you're not using it.
And even if that'll wear down the battery faster, it's not enough that you'll go from 35hr of charge to 2hr in the span of a year. Hell, that'd probably take over a decade to happen.
You're getting downvoted because you're being a complete idiot. Quit being defensive about it and just move on.