My apologies if this has already been posted, but I searched online and this forum for the simple location of the battery. Much easier than earlier cars. Slide passenger seat all the way forward. Behind
the seat, lower right hand as you look behind the seat is a finger pull mouse hole. Pull away panel, voila!

 

**** man......I think I earned a hernia earlier this past spring dropping in a very heavy Oddessy battery. Flexibility and strength required. Yours looks delightfully easy

 

Thank you for posting, I think this will be on the to-do list soon enough - I_Gotta_Vantage shared a perfect fit battery: https://www.6speedonline.com/forums/...ry-option.html