Milwaukee?... Looks like my 12vt Milwaukee battery and charger. Of course it probably has some minor change to make it Ravin proprietary.It is a 12 volt Marty. Here is a link showing it.
NEW FOR 2021 / AVAILABLE SPRING 2021 12 Volt Lithium Battery For Ravin Electric Drive Battery Weight: 800 Grams Easily Attaches and Detaches From Unit Battery Capacity: 3000 Milliampere Hour (mAh) For Use With R500 Series Onlyravincrossbows.com