The purpose of the R & D is trying to improve the function of the prototype of the AEV, and the first test is battery test.
The battery provides the energy for the AEV to work, it is important to test the efficiency of the battery under different voltage to ensure the AEV can work properly under different voltage.
In this test the same code was used to ensure that the command from the controller is the same.
motorSpeed(4,25);
goFor(10);
brake(4);
Using the code above, the 40% of motor is used to run for the constant time. The picture blow is the test data, and the voltage of the battery before and after every test is tested, and the distance the AEV traveled every time is recorded too.
| Test number | Voltage Before | Voltage After | Distance | Motor % |
| 1 | 8.41 | 8.39 | 44in. | 40 |
| 2 | 8.39 | 8.38 | 79in. | 40 |
| 3 | 8.47 | 8.44 | 9in | 40 |
| 4 | 8.44 | 8.42 | 15in. | 40 |
| 5 | 8.42 | 8.4 | 82in. | 40 |
The test was repeated for 5 times, and the first two was conducted with the same battery, and test 3 to test 5 were conducted with the same battery for different lab sessions. All the voltage change are small and about 0.02V, but the distance varies a lot. And there is a big gap from data to data. The cause of the different distance might be the friction at the beginning which the AEV started to move. But distances gained from test 2 and test 5 still show that the distance that traveled is nearly the same.
The plot of the power vs. time 
All the 5 tests are plotted on the picture to get a better contrast. From the plot, the track of the energy output is nearly the same for all 5 tests, which means the difference of voltage is not a critical factor for the motor energy output.
Limitation: The change of voltage is small, so the impact on the energy output can be small too. A longer track and longer distance traveled every time might be helpful.