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The quad-cell should be much more powerful than the stock dual-cell. It should be a little hard to control with 4 cells, and have a slight tendency to flip onto its back when starting forward.
If you went from 2 cells to 4 cells, and only notice an increased run time, you may have accidentally hooked up the batteries in parallel instead of series. Parallel will give you extended run times (current). Series will give you more power (voltage). Here’s a diagram of how the batteries should be connected, if you are running both extra cells from the battery in the back of the truck.
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