I have 3 laptops from 2009, 2012, and 2015. I haven't used them since 2012, 2015, and 2021. I went on to using my newest from 2022 and several tablets. All of the older laptops were still functioning quite well when I retired them to a shelf. I'd like to check them out to find lots of old files and old freeware. I'm a bit concerned if it's possibly unsafe to turn them on due to perhaps a malfunctioning old battery. Should I take them to some reliable local repair service instead and let them check them out?