documentclass[border=1mm]{standalone}
usepackage[utf8]{inputenc}     % utf8 Codificacao do documento (conversão automática dos acentos)
usepackage[siunitx,american]{circuitikz}
usepackage{pgfplots}

usetikzlibrary{arrows.meta,
    decorations.pathreplacing,
}



begin{document}

% Definição do Estilo e dos Eixos
pgfplotsset{width=7cm,compat=newest,xmin=0,xmax=8500,ymin=2}

begin{tikzpicture}

begin{axis}[xlabel=Tempo(s), ylabel=Tensão (V),,grid=major,ytick distance=0.5]

addlegendentry{Curva de Descarga}

% Plotagem dos Pontos para plotagem do gráfico

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};
|- (axis cs:0,0) -- cycle;


% Preenchimento da área abaixo da curba

addplot
[blue!80!black,fill=blue,fill opacity=0.5]
coordinates
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|- (axis cs:0,0) -- cycle;


%addplot
%[blue!80!black,fill=red,fill opacity=0.5]
%coordinates
%{  (4,12.15)
%   (5,12.12)
%   (6,12.08)
%}
%|- (axis cs:0,0) -- cycle;

end{axis}

end{tikzpicture}
end{document}

documentclass[border=1mm]{standalone}
usepackage[utf8]{inputenc}     % utf8 Codificacao do documento (conversão automática dos acentos)
usepackage[siunitx,american]{circuitikz}
usepackage{pgfplots}
pgfplotsset{compat=1.16}
usetikzlibrary{arrows.meta,
    decorations.pathreplacing,
}

usepgfplotslibrary{fillbetween} % <-added


begin{document}

% Definição do Estilo e dos Eixos
pgfplotsset{width=7cm,compat=newest,xmin=0,xmax=8500,ymin=2}

begin{tikzpicture}

begin{axis}[xlabel=Tempo(s), ylabel=Tensão (V),,grid=major,ytick distance=0.5]

addlegendentry{Curva de Descarga}

% Plotagem dos Pontos para plotagem do gráfico

addplot[color=red,mark=x,name path=A] coordinates {

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};
|- (axis cs:0,0) -- cycle;

    path [name path=B]
        (pgfkeysvalueof{/pgfplots/xmin},2) --
        (pgfkeysvalueof{/pgfplots/xmax},2);

    addplot [green!50] fill between [
        of=A and B,
        soft clip={domain=0:1000},
    ];

    addplot [purple!50] fill between [
        of=A and B,
        soft clip={domain=1000:6000},
    ];

    addplot [blue!50] fill between [
        of=A and B,
        soft clip={domain=6000:8000},
    ];
end{axis}

end{tikzpicture}
end{document}