The Home Plus battery is quite large and fits best in one particular way shown below.
Position the battery facing inward, standing end with the connector cables passing over the top of the battery - this prevents putting stress on the cables where they connect to the battery itself. 👍
You may opt to run it with the cover off, if you know your dog won't grab the lure and drag the drive around the yard. If there is a risk of this, use the cover, as damage to the connector can result, and the fix includes replacing the PCB which can be expensive.