Highly rated BigBattery with low temp cutoff, more than twice the Ah of the Relion with 10 year warranty, cost less per Ah and made in USA. Beware that the size may not be good for your battery box-measure first. https://bigbattery.com/products/12v-...28ah-3-018kwh/
Overall Will liked it a lot except for the absence of a low temp. cut off. Will thought it was a good value for the money BUT.........he still prefers the SOK