DTLRSHP 110 - DIY Aux 12V 1280wH Lithium LifePO4 Battery for under $350 versatile charging solution

DIY solution for a 1280wH (100AH@12V) aux battery build with a solution for DC-AC-DC charging without having to buy a dedicated DC-DC charger.
$350 threshold does NOT include the price of the inverter, charger, and some common tools since there are many other cheaper, and more expensive options
Links are affiliate links and I will get commission if you use them!
Price as of 3/17/2021
Liitokala 3.2 100AH LifePO4 Batteries $168
www.aliexpress...
AiLi Voltmeter Ammeter Voltage Current Meter $41
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12V LiFePO4 BMS 4S 80A 100A $57.29
www.aliexpress...
Circuit Breaker Reset $10.81
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Kohree 6 Way 12V Blade Fuse Block $17.88
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Heat Shrink $8.99
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Terminal Variety Pack $6.99
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Kohree 5 Gang Rocker Switch $26.98
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50 Amp Battery Connectors for sb50 50A $9.90
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Plano Deep Field Box 1612 $13.92
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Expandable Sleeves (Optional) $11.98
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Hammer Lug Crimper (Optional - Other methods out there to crimp too) $24.99
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Bestek 500w pure sine wave inverter (Optional - You can get a larger or smaller one.) $61.99
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Charger (Optional - You can get a faster/slower/cheaper/more expensive one) $104.21
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Wiring, I used left over car audio OFC 4ga and 8ga wiring that I had, Knukonceptz.com is a great place for them.