Replacement batteries for Phoenix

[Jefferson]

IT is time to replace the batteries in my Phoenix.
 

The plan right now is to replace them with what was original equipment: Odyssey PC-625 AGM battery.
 

Any other thoughts?

[Foley]

I Have a Lithium in front and a lead acid in back for soaring. lithiums die instantly, lead acid dies slowly.

[Barry.h]

I changed to 2 x Lithium a while back. Yes, lithium drops off quickly (not instantly) when flat, but for the same size and much less weight you get a lot more capacity. I mainly wanted more capacity for extended soaring.

DONT CUT CORNERS. I assume you have seen video of lithium (iron) batteries burning. Only use aviation grade which address all (?) the safety issues. I used EarthX, I think they are the leaders and are certified in many aircraft. There is a Letter of Authority floating around from Jim Lee's days providing the authority to make the change. (we are LSA remember!)

EarthX say they are fine with your old regulator, but I changed to a better regulator set to lithium voltages. I think you might get more charge in, but check with EarthX.

It soundes like you have 2 batteries now. How are they wired/switched? I have mine separated; one for avionics and one for the engine, so if I do run the avionics low (has happened a few times)  I always have the starter battery. And if the starter battery dies, I can switch the avionics (bigger) in to start the engine.

Since I changed I don't get any brown-out reboots of the avionics when starting, much longer soaring time with all the avionics and plenty of starting grunt.

[Alex Ress]

Because you have an LSA, you have lots of great options battery options.  Two options are the certified batteries made by EarthX and Concorde.  Those companies paid untold sums to get their products legal to be on Part 23 aircraft and they are priced as such to make their money back.  Since you cleverly bought and fly a aircraft that has been made to ASTM standards instead of Part 23, you have many more options.  These standards have been shown to result in no loss of safety and are why the LSAs have been expanded under MOSAIC.  I use two AGM batteries.  We'll save the advantages of an aft CG for another thread.

[Jefferson]

Thanks all. After some consideration, I am comfortable to use the Odyssey PC-625 AGM battery. And my battery switch has either/or/both positions.