I'm trying to "re-train" my battery by draining it completely at least once (I've been recharging it at the 50% point for two years). Is there an app for that?
lithium ion batties dont have a memory per se like old NiCad batteries did. you dont need to retrain anything....its not a dog.
in fact, lithium ion batteries "like" being topped off every now an then from a partial charge instead of full drain and full recharge cycling. theres been millions of discussions and arguements about this topic over the past few years and other web-sourced information backing this data up.
if you must disregard what i say, i think there is an option to force discharge the battery in the engineering screen. have fun.