Have been checking into LiFePO4 batteries. Was concerned about the Lithium ion "Tesla"effect in which everything within a 50 meter radius is suddenly incinerated. However, I found a Colorado company called Earth-X that assembles their batteries in the US. They have achieved FAA certification for use in aircraft, so that must amount to something. 2 year full replacement warranty. Even though $$$, I decided to bite the battery and order one.
Very small, and light, as expected. 13.65v as delivered. Took some cranking to blow the cobwebs out, but once it fired off, all was good. Definitely starts faster than the Yuasa AGM that was dying. And apparently, as the battery type has more cranking amps as it warms up(?)
All new stuff to me, but anything that starts the V11 and lightens it up is OK with me.