My S4 is four and a half years old, and today, on starting for the first time in four days, I got the DIS warning that the battery is low and will be charged whilst driving. Sadly, it was only a short journey. I don't have any devices on permanent live, so I’m thinking maybe it’s telling me the battery would prefer not to go through a fifth winter. My plan is to get my garage to check for a drain and assuming it doesn’t find one, put a new battery in. Thoughts, anyone?