As above were their issues involved

3 hours ago, ThuMentaliss said:

As above were their issues involved

 

IMHO this is not the way to go .

 

Are we talking starter battery or leisure battery ?

 

Either way, I believe Lithium batteries need a different charging regime than Lead Acid or Gel.

A starter battery needs to deliver very high current without damaging itself.

I believe the properties and discharge characteristics of the three technologies are quite different.

 

Not sure the Toyota alternators are suitable for Lithium technology.

 

Interesting though, I need to research this.

Lithium batteries are generally not recommended for use as an engine start battery (Burstner source)

As a starter battery - no. It's too hot for one under the bonnet and they don't like delivering the peak current to start the engine.

As a second leisure battery - yes. It's under the driver's seat. You can't directly connect to the alternator as the Alphard has an adaptive voltage alternator. When it's cold it'll deliver 14.2V, but when it's warm, it drops back to 13.4V - too low to charge Lifepo4 chemistry. You can use a DC-DC charger such as the Victron Orion that will give the correct charge profile for lithium.