Welcome to Android Central! How old is that battery? Batteries don't last forever -- their ability to hold a charge will gradually deteriorate over time, and the rate at which this happens depends on numerous factors, including your charging habits. If you habitually let the battery drop to zero or near-zero, that significantly decreases the battery's overall lifespan. It's generally recommended to start recharging once the battery hits 30-40%.
So to answer your question -- no, this isn't some conspiracy on Samsung's or Google's part. Sometimes, a system update can cause increased battery usage, but this wouldn't cause the battery to charge up slowly -- that sounds much more like a failing battery.
05-15-2017 11:25 AM