18650 Battery analyses

An important part of the project is the longevity of the batteries the following batteries were selected to give a range of capacity and degradation effects over time. 10 batteries were selected from a set of 50. 2 are severely derogated batteries and the 2 are slightly derogated and the remaining 6 have average derogation.

Table of current batteries

Battery Num. Capacity maH Volts unloaded Volts Loaded Voltage drop Internal Ω Normalized internal Ω
1 2000 4.2 3.87 0.33 330 660.0
2 1931 4.11 3.82 0.29 290 560.0
3 1381 4.1 3.77 0.33 330 455.7
4 1808 4.05 3.83 0.22 220 397.8
5 1849 4.05 3.85 0.20 200 369.8
6 1702 4 3.77 0.23 230 391.5
7 1890 4.11 3.83 0.28 280 529.2
8 1392 4.01 3.73 0.28 280 389.8
9 2000 4.28 4.1 0.18 180 360.0
10 1719 4.05 3.62 0.43 430 739.2

Battery Discharge graphs

Battery 1

Battery 2

Battery 3

Battery 4

Battery 5

Close up of Battery 5

Battery 6

Battery 7, 1 Amp

Battery 7, 0.3amp Total discharge time was 401 min 6.68 hours

Close up Battery 7 voltage drop, 0.3 amps

Battery 8, 1amp

Battery 9, 0.3 amp

Close up of battery 9

Battery 10, 1 amp

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