What are the practical/operational differences between the sealed lead acid and the lithium batteries?

What are the practical/operational differences between the sealed lead acid and the lithium batteries?

Bat-Caddy: the fairly new and emerging lithium technology for golf carts offers a significantly higher power density, which means that much more power can be stored in a much smaller and lighter space. Practically that results in a much lighter and smaller battery with longer durability per charge as well as a much longer life time. Specifically, you can now replace a 12V 35Ah SLA battery on a remote controlled caddy with two motors usually running 27 holes per charge with a total lifetime of about 150 charges, with a 12V 20/21Ah Lithium battery running 36 holes per charge and a total lifetime of about 500 charges. This increases the number of rounds by a factor of 4 -5. This all while at the same time reducing the weight by 75% and the size of the battery by 50%+, so less handling and storage effort. Lastly, the absence of lead makes the lithium battery more environmentally friendly. The slight drawback is the still much higher price of the lithium battery, but economically that can be justified by the much better performance and higher convenience.