It is a group 14 size..... YT14B-BS. YT is the aftermarket series.
IF you want the closest to OEM quality, you can order the GT14-B4 from OEM parts suppliers.... Partzilla link........ these are made by at the GS Yuasa plant overseas.
www.partzilla.com
I would advise plugging in a battery tender if it's going to sit for a week, otherwise, longevity will likely suffer. Or go ride. Or disconnect the battery, which will avoid the parasitic drain of the bike's electronics.
IF you want the closest to OEM quality, you can order the GT14-B4 from OEM parts suppliers.... Partzilla link........ these are made by at the GS Yuasa plant overseas.
Yamaha GT1-4B400-00-00 - BATTERY GT14B4 GS | Partzilla.com
Buy Yamaha GT1-4B400-00-00 - BATTERY GT14B4 GS. This OEM part is guaranteed by Yamaha's limited part warranty ✓ FREE Shipping on qualified orders - Partzilla.com

I would advise plugging in a battery tender if it's going to sit for a week, otherwise, longevity will likely suffer. Or go ride. Or disconnect the battery, which will avoid the parasitic drain of the bike's electronics.