This mount bolts to the stock battery tray mount in a Volvo 240. It allows you to mount a Noco NLP20 Lithium battery in place of the stock lead acid. The Noco battery is 3.7lbs compared to the 50+ the stock battery is. I have been testing this battery for a year in my rally car. It sits outside in the snow and while the lead acid fleet often has trouble in below freezing temperatures this starts every time. Seemingly now down side, better starting, less trouble in a wider range of temperatures, MUCH less weight, takes up less space and at a cost at or below the cost of a replacement lead acid battery.
Shipping restrictions on lithium makes stocking and shipping them difficult. The battery itself can be found on Amazon here