我们可以用前面的方法做更多的柠檬电池，并用金属线将他们之间的正负极连接起来来让电压加成。
Building more lemon batteries and connecting them with a metal wire from "+" to "-" adds the voltage from each cell.
由平点后面出来的线必须被连接到电池的负极。另外一根则连接到正极。
The wire that comes out beside the flat spot must connect to the "-" side of a battery, the other wire to the "+" side.
接电源时，要将控制器的红色线夹接‘正极’，绿色线夹接‘负极’。
The red cable of controller should clamp the positive electrode and the green cable of controller clamp the cathode when connecting the power.
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