i have this type on my car got at auto parts store. dont drive much so opening hood not a big deal.
https://www.amazon.com/Cllena-Battery-Disconnect-Cut-off-Terminal/dp/B01IQRMFWY/ref=sr_1_45?ie=UTF8&qid=1550337031&sr=8-45&keywords=battery+disconnect
had this inside a truck mounted on seat base...