40% off is a killer deal. I bought this one by Noco based on a lot of advice from a boating forum I frequent. I paid $200 but I see it is on sale for $150. The
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Walked out on a Monday to a stone dead battery. Ordered it at 8:00 and somehow it was on my front steps before 11:00 that same morning. (I had a spare vehicle to go to work with) But 40% off an XP-10 is a much better deal.