"Torqeedo Battery Average capacity loss" continued from above post:
Torqeedo Battery Chemistry: LiNMC (lithium nickel manganese cobalt oxide)http://www.torqeedo.com/us/en-us/products/batteries/power-26-104/2103-00.html
Lithium Manganese Oxide (LiMn2O4)
Most Li-manganese batteries blend with lithium nickel manganese cobalt oxide (NMC) to improve the specific energy and prolong the life span. This combination brings out the best in each system, and the LMO (NMC) is chosen for most electric vehicles, such as the Nissan Leaf, Chevy Volt and BMW i3.http://batteryuniversity.com/learn/article/types_of_lithium_ion
Which leads to articles on Nissan Leaf having serious temperature related capacity loss issues for cars located in Arizona and Texas heat:
All The Results From Independent Test Of Nissan LEAFs With Lost Capacity. Not All Instrument Failure
The Nissan LEAF electric car was introduced to the world as a mass production vehicle during December 2010. Almost 40,000 have been sold around the world in the short time since then, with well over 10,000 sold in the USA. Unfortunately, a percentage of those USA cars that are operated in hot climates, such as Phoenix, Arizona, and the state of Texas, have experienced accelerated losses of the vehicle’s range autonomy, when compared to its performance when new. The phenomenon is not relegated solely to areas of extreme heat; many LEAFs now in moderate temperature areas of California have also experienced significant range autonomy reduction, however not yet to the extent of those cars exposed to Arizona and Texas heat.http://insideevs.com/all-the-results-from-the-largest-independent-test-of-nissan-leafs-with-lost-capacity-not-instrument-failure/
Nissan Leaf Lawsuit: New Battery Replacement for Unhappy Customershttp://www.greenoptimistic.com/nissan-leaf-lawsuit-battery/#.V9VyMa1v4aA
So in deep diving into battery technology, this paper gives the first clue after a couple of hours of research:
On page 48 you see the battery charging graphs in Seattle vs Phoenix:
Battery Durability in Electrified Vehicle Applications:
Geek Alert Warning, this paper goes deep, such as:
Moreover, changes in the stoichiometry of the transition metals have been reported in aged NMC materials.https://www2.unece.org/wiki/download/attachments/29884985/EVE-18-04e.pdf?api=v2
The Torqeedo 26-104 is a passivly cooled LiNMC battery. Located in the bilge area of a HC or HDC in full Texas sun I'm guessing it may see temperatures of 100-120 degrees on a hot day. Since I plan to keep it in a covered slip even there I suspect the bilge area would still get to about 90-110 degrees on a hot day.
So the next question is, does this just really beg to say, at $2,600 per battery, do I want to go there. Or, perhaps if I put a timer on the charger and only allow charging at night during the low temperature of the day that maybe this will help increase the battery life? Recommendation: More research required.