Electric tracked mini Tank project

EpsilonZero

...still cheaper than a boat!
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Running all of the batteries at once instead of switching will put less strain on them (lower drain rate, less heat, less voltage drop). You will go faster longer with the reduced voltage drop. Functional Artist actually just did a video of his latest dual motor kart showing some stats regarding voltage drop and speed, if you want to see it in the real world.

As far as having a second battery for the accessories; that is up to you but I prefer one plug for my creations so I use step down transformers. They are small and cheap and the load is spread among all the batteries. So, they get used at the same rate and replaced at the same time.
 
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