North American Clean Energy, Mar. 2017.
http://www.nacleanenergy.com/articles/25692/5-things-to-look-for-in-your-next-battery

"With hundreds of battery types and styles to choose from, how do you sift through spec sheets and marketing to find the right battery for you? Battery technology is key. Many batteries -- commercial, automotive, and UPS -- can’t handle constant cycling in renewable energy systems. Lithium-ion batteries are maintenance-free but have the highest cost per ampere-hour (Ah). They also pose fire and thermal runaway risks and cannot be fully recycled. In most, but not all, cases, lead-acid batteries are the best fit. They have the highest ROI, over 100 years of safe use, and are the most recyclable product in North America."