Auto battery life can be significantly lengthened with the use of a trickle charger. Significantly. I put this one into my 4X4 to keep my Interstate battery at maximum readiness. This is a solid heavy duty device and is no toy. I mounted it securely under the hood next to the battery itself and have a heavy duty plug hanging down -- just behind the front bumper -- to connect up while out in the driveway. The lights/indicators on this model are very nice and it keeps my battery at full strength. If you have two vehicles (or more) and you don't drive one of them that often -- definitely get one of these. You will never have another "oh no" moment -- when turning that key in the morning. Highly recommended.