## 3 Effects of Storage and Maintenance Modes on Battery Performance
### Effects of Rest Time on Battery Performance
#### 3.3.2 Effects of Rest Time on Battery Power  
With a present SOC of 80%, 50%, and 20%, the effects of different rest times on battery charge-discharge power were evaluated. The test results of methods 2, 3, 4, and 6 show that the 5-min rest time presented itself as the best approach to maintain the power of Ni-MH battery modules. The test results are listed in Tables 4 and 5.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**SOC Value** & **Manufacturer** & \begin{tabular}{c} **Method** \\ **Number** \\ \end{tabular} & \begin{tabular}{c} **Rest Time** \\ **(min)** \\ \end{tabular} & \
\begin{tabular}{c} **Change Rate of** \\ **Charge Power** \\ \end{tabular} &
\begin{tabular}{c} **Change Rate of** \\ **Discharge Power** \\ \end{tabular} \\ \hline \multirow{3}{*}{80\% SOC} & A & 2 & 5 & \(-10.3\%\) & \(-11.9\%\) \\  & A & 3 & \(15\) & \(-13.7\%\) & \(-13.6\%\) \\  & B & 2 & 5 & \(-11.9\%\) & \(-22.6\%\) \\  & B & 3 & \(15\) & \(-13.2\%\) & \(-26.6\%\) \\ \hline \multirow{3}{*}{50\% SOC} & A & 2 & 5 & \(-10.5\%\) & \(-9.4\%\) \\  & A & 3 & \(15\) & \(-16.8\%\) & \(-14.4\%\) \\  & B & 2 & 5 & \(-21.4\%\) & \(-22.8\%\) \\  & B & 3 & \(15\) & \(-26.4\%\) & \(-27.3\%\) \\ \hline \multirow{3}{*}{20\% SOC} & A & 2 & 5 & \(-11.2\%\) & \(-20.8\%\) \\  & A & 3 & \(15\) & \(-16.8\%\) & \(-25.8\%\) \\ \cline{1-1}  & B & 2 & 5 & \(-22.7\%\) & \(-11.9\%\) \\ \hline \hline \end{tabular}
\end{table}
Table 4: Effects of different rest times on power change rate of Ni-MH battery modules with different SOC (\(DDC\) mode).  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Manufacturer** & \begin{tabular}{c} **Method** \\ **Number** \\ \end{tabular} & \begin{tabular}{c} **Rest Time** \\ **(min)** \\ \end{tabular} & \begin{tabular}{c} **Charge** \\ **Retention Rate** \\ \end{tabular} & \begin{tabular}{c} **Discharge** \\ **Capacity (Ah)** \\ \end{tabular} & \
\begin{tabular}{c} **Initial** \\ **Capacity (Ah)** \\ \end{tabular} &
\begin{tabular}{c} **Capacity** \\ **Recovery Rate** \\ \end{tabular} \\ \hline \multirow{3}{*}{A} & 2 & 5 & 63.6\% & 5.76 & 5.78 & 99.6\% \\  & 3 & 15 & 65.1\% & 5.74 & 5.78 & 99.3\% \\ \hline \multirow{3}{*}{B} & 2 & 5 & 61.1\% & 5.7 & 5.7 & 99.5\% \\  & 3 & 15 & 61.1\% & 5.7 & 5.8 & 98.1\% \\ \hline \hline \end{tabular}
\end{table}
Table 2: Effects of different rest times on capacity of Ni-MH battery modules (\(DDC\) mode).  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Source Value** & **Manufacturer** & \begin{tabular}{c} **Method** \\ **Number** \\ \end{tabular} & \begin{tabular}{c} **Rest Time** \\ **(min)** \\ \end{tabular} & \begin{tabular}{c} **Change Rate of** \\ **(min)** \\ \end{tabular} & \
\begin{tabular}{c} **Change Rate of** \\ **Charge Power** \\ \end{tabular} &
\begin{tabular}{c} **Change Rate of** \\ **Discharge Power** \\ \end{tabular} \\ \hline \multirow{3}{*}{80\% SOC} & A & 2 & 5 & \(-10.3\%\) & \(-11.9\%\) \\  & A & 3 & \(15\) & \(-13.7\%\) & \(-13.6\%\) \\  & B & 2 & 5 & \(-11.9\%\) & \(-22.6\%\) \\  & B & 3 & \(15\) & \(-13.2\%\) & \(-26.6\%\) \\ \hline \multirow{3}{*}{50\% SOC} & A & 2 & 5 & \(-10.5\%\) & \(-9.4\%\) \\  & A & 3 & \(15\) & \(-16.8\%\) & \(-14.4\%\) \\  & B & 2 & 5 & \(-21.4\%\) & \(-22.8\%\) \\  & B & 3 & \(15\) & \(-26.4\%\) & \(-27.3\%\) \\ \hline \multirow{3}{*}{20\% SOC} & A & 2 & 5 & \(-11.2\%\) & \(-20.8\%\) \\  & A & 3 & \(15\) & \(-16.8\%\) & \(-25.8\%\) \\ \cline{1-1}  & B & 2 & 5 & \(-22.7\%\) & \(-11.9\%\) \\ \cline{1-1}  & B & 3 & \(15\) & \(-28.5\%\) & \(-12.2\%\) \\ \hline \hline \end{tabular}
\end{table}
Table 4: Effects of different rest times on power change rate of Ni-MH battery modules with different SOC (\(DDC\) mode).