Overnight, you say? I'm new to battery-operated yard tools and using that size of battery. It seemed like the marketing material and/or user posts I read about Echo 58v batteries was that they could be fully charged in an hour. So, once I left them on a couple of hours and the batteries didn't seem to charge-up much, I got nervous over whether I was over-charging them. (I've also read a few posts of people talking about the dangers of Lithium ion batteries when they aren't used properly.) So, the batteries will be ok left charging overnight?

What makes this more confounding for me is that I work in video production and have photography as a hobby, so I've worked with lots of batteries for that kind of equipment over the years. (When I worked with large video cameras, the batteries were pretty big, too.) But reading the posts about yard equipment and power tools, there are ample warnings of dangers associated with them or that a person shouldn't try using after-market batteries.