If you have any sort of vehicle that spends long amounts of time sitting around idly between uses — whether it's an RV, a lawn mower or tractor, a boat or jetski, a scooter/ATV/golf cart, or whatever else — then you probably already know how imporant it is to stay on top of the battery charge. A smart trickle charger like this one makes this a very easy task and gives you peace of mind that any battery you hook it up to will always be ready to go when you need it.

I should mention off the bat that this is NOT a portable jump starter and you shouldn't try to use it as one. Rather, when the vehicle's parked in your garage/shed or wherever else, what you do is...

1. Hook the charger to the battery terminals.
2. Plug the charger into a wall outlet.
3. Walk away.

That's it. While you're gone, the charger intelligently keeps the battery topped up without overcharging it, thanks to the float/maintenance mode it automatically switches to when the battery's full. There are no buttons or settings to futz around with; you just plug it in when needed and it quietly does its job so you can attend to other things of importance without worry.

Get this charger for $21 on Amazon.