This looks like the perfect charging unit for my marine batteries. No further need of battery tenders. This charger does it all. If there is a negative to the unit is the heat. If your batteries are low this unit will get pretty warm. Do not put it against carpet or any hard composite materials and leave plenty of air to help from getting too warm. I would have loved to see this unit come with some stand offs to keep it off of the carpet lining of the battery compartment. I ended up stacking 1/4 nuts (three on top of each other) to make stand offs to mount on the side of the battery compartment. The pulse condition phase of the charging is great. That helps clean off any sulfation to keep the battery at peak performance.