I recently bought this lawnmower and from the start I am surprised by its excellent performance. There is little assembly required when the lawnmower arrives and if one follows the instructions it's easy to do.
Once assembled, one can insert one of the two batteries and start using it right away. The batteries were pre-charged and ready to use.
On my first use, the battery needed to be replaced halfway through my averaged sized lawn, but now that I have used and charged the batteries a few times I am able to finish on one battery. It's a strong little performer!