Most likely locations are under the seat, or under the hood, between the engine and the dash.
Going by what you say, it has to be under the seat then. Nothing under the hood between the engine and dash.
I'll check tomorrow. It doesn't need changing or charging yet, but I should know where things are...lol
From your other thread. The model number is also located under the seat. Either on the bottom of the seat tip plate or next to the battery