As discussed previously, the acidic conditions appeared to have a positive effect on the stability and reversibility of NHPI electrode. This conclusion can be confirmed in Figure (b). In Figure (b) that, evident discharge platforms are presented. In terms of the charging profiles, the difference in length from the discharging platform is within a certain range, which indicates that the increase in acidity of the electrolyte can indeed improve the performance of the battery and reduce the decomposition of the NHPI. However, in the system containing the zinc electrode, the pH of the electrolyte is not the lower the better, which can be seen from Fig. ). It can be clearly seen that a battery having an electrolyte pH of 0.99 does not perform as well as a battery having an electrolyte pH of 1.26. In the five charge and discharge cycles in Figure (c), only the first three have a relatively obvious discharge platform, and the duration of the discharge platform is much smaller than that of the charging platform. In Figure , the battery with the lowest pH value of the electrolyte does not have the best performance, which is not inconsistent with the test results of the previous CV, since the zinc electrode was not introduced in the CV test. The instability of the zinc electrode in the strongly acidic electrolyte resulted in the result of GCPL. The comparison of the battery capacity Figure can also confirm this analysis on the other hand.