Your traction battery will be fine, charge it up as you like but do yourself a favor and put your 12V battery on a low amperage charger overnight. God only knows how long its been sitting at low state of charge since being last used or installed. Mine was buggered right off the bat, it was factory ordered and the only delay from its birth to my hands was the 8 weeks of transport and prep. This was before the BMS update that addressed some of the 12V battery charging deficiencies, so that may have helped.