I ran it yesterday in the car and in daytime i only have a 2.5A draw. That's 0.28C at nominal capacity, 0.57C at 50% and 1.1C at 25% - seems safe enough.
As for the batteries being of different types: Each parallel quadruplet consists of one purple, one blue and two green cells, so that evens things out. And the purpose of those little white wires is to be able to keep check on the voltage of each quadruplet.
As for explosions, the whole pack at nominal capacity is only 15grams TNT equivalent..
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)