I live about 30 miles from them...I have not driven there yet because I am not seeing any kind of rating on the web site..William said they would be "B" grade, but their site hasn't changed... I do not want to purchase a 60% battery.... Now here at Tech Direct they show for $150.00 more 80%... https://www.techdirectclub.com/byd-lfp-24v-5-kwh-200-ah-battery-pack-with-bms-130a-lifepo4/