Screw warranty's and durability. Would you use one to power your aircraft ? Well being out in the middle of the pond in your boat knowing no fire extinguisher can put out a lithium battery fire would give me pause...
Despite the many advantages of lithium-ion batteries, a significant safety drawback is the possibility that these batteries can overheat, catch fire, and cause explosions. Fires involving various lithium-ion battery products have increased at an alarming rate, resulting in numerous injuries and fatalities