Hey. I got that losi xxx-t off ebay and love it so far, although 3 of the 5 batteries I cannot get to work, they came unsoldered but with all the supplies to solder them. I soldered them all but when I plug one of the 3 in the car just goes pinned if it is on or off or whatever, I think it is because one of the batteries had the positive on the negative and vice versa because when I look at the 2 working batterys the black/red cables are on opposite sides. If they were just opposite, would the car go pinned?

if the polarity is bwrong, it will cause the speedo to basically short out.. it can cause damage.. most likely it already has.. the polarity has to be right in order for it to work right..

well it probably did because my speed control doesnt go in reverse or brake so shit. could that do that?