"My Accumate is now 15 years old. I note that the latest version(link is external) is labelled as AGM, GEL and STD, whereas mine states just STD -- due to its age, no doubt?" Yes. For anyone buying a smart conditioning charger make sure that it has enough oomph for the biggest battery on which you're going to use it and enough modes for all of them. Nowadays that will probably include AGM and might include lithium. Jonathan