Switching Agm Batteries to Lithium

[GamerPlayer]

Hello everyone. I'm new to the forum. I want to upgrade my batteries from 2 Group 31 agms to a Lithium battery. I'm running: 2010 Lincoln MKZ

Pioneer DMH 8660Nex Headunit

Clarion 7 band eq

4 DS18 6PRO300MB-8 6.5' Loudspeakers

4 DS18 Pro TWX1 Tweeters

1 DS18 HOOL-X15.1DHE Sub

1 DS18 H-k05 Amp-Mono

1 DS18 DSP8.6iA Amp 

1 Duracell Ultra BCI Group 31 battery-Main

2 group 31 agms-Trunk

Big 3 upgrade

1 JS Alternators 320amp Highoutput

SUB: 4K RMS

AMP: 5K RMS / 9200W(BURST)@.5 ohms

 

 

I talked to the owner at a local audio shop for the upgrade. He said it would cost around $1700 for the upgrade without going into any details. I'm not sure if that's correct. Does anyone know what size or type of lithium battery install for my audio set-up? Any info would be greatly appreciated.