Re: What to do with LiFePO4 batteries when the boat is layed up?

Mike Longcor (SV Trilogy)

Hi Joerg,
To answer your question, charging to 100% is OK for Lithium Iron Phosphate batteries (LiFePO4), which is the chemistry Elon refers to by "iron pack".
Edit: By nickel, he refers to lithium nickel-cobalt-aluminun oxide (NCA) batteries. Nickel-lithium batteries (Ni-Li) are experimental.
As Scott has said, big difference in holding them at 100% vs charging them to 100% before starting discharge phase.
There's lots of info on this forum about storing LiFePO4 batteries. Leaving them disconnected at their optimal SOC is probably best, but depends how the boat will be left, how long, if some systems need power, bilge pump, etc.
Mike Longcor
SV Trilogy SM23

On Sat, Jan 15, 2022, 5:35 AM Joerg Esdorn via <> wrote:

I’m reading an article in the Wall Street Journal this morning about Lithium Iron Phosphate batteries become the prevailing battery technology for electric cars in China.  The article includes the following quote of Elon Musk: “I’d personally slightly opt for the iron pack, as it wants to be charged to 100% whereas nickel prefers ~90%.”  So is there really no concern about charging LiFePO4 batteries to 100% or is Elon talking about a different technology?  

Joerg Esdorn
A55 #53 Kincsem
Currently in La Rochelle 



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