This was a great bargain. It is difficult to assemble, especially the battery and connections because there is NO room to work.  The instructions are unclear.  It does not come with or recommend traction bands, which it clearly requires, since it gets stuck in the grass and moves VERY SLOWLY even on the pavement.  Not sure if there is a short in the circuitry or if it just doesn't hold the charge as long as it's supposed to, but it's constantly dying on us!!  I wouldn't have bought this model if I had known all this before.  Spend the money on the better styles, they're well worth it!