"After running these batteries since February I'm finally able to write my review. These batteries have not let me down yet. After having to replace multiple lithium batteries in the past from other manufacturers I will say these are built to a higher level and you definitely get what you pay for. My 2 100ah batteries have not left my boat since I installed them. With all my other batteries I have removed After each use since I was worried about them going bad. I don't have that problem any longer. I was able to loose about 80lbs from the boat and couldn't be happier. I will be ordering more batteries in the future for my kayak that's how much I believe in the build quality and battery components being used. Do your own research but these will be the only batteries I will run from this point forward."