I have several trickle chargers similar to this.  I use them mainly in the Winter, but also have one in a gas golf cart and a boat that stays at a campground in storage for weeks at a time sometimes.  At home I use them in lawn tractors and a bigger compact tractor in the Winter to keep the batteries topped off.  This one is similar in shape and design to the others I have but it weighs about 1/3 as much.  I was really surprised when I took it out of the packaging.  It doesn't look like it will break easily but there is something about it that just makes it feel kind of cheap.  That being said, I haven't used it long enough to really judge the reliability.  I hooked it up to a zero turn mower today and it seems to be working.  I'll update my review if there are any issues.