Shorai LFX36 survived a one year test on R80G/S with excellent results. which included starting down to 15f. combined with short rides with heated gear, then successful starting R80G/S next morning at 20f ... EarthX ETX36 is just getting started on R80G/S and has done several cold starts on shorts rides with heated gear. then successfully starting next morning. ETX36 has also passed 200amp crank tests with flying colors. jury is still out on long term performance... but I see no reason why EarthX ETX36 shouldn't be equal in performance to Shorai LFX36. EarthX ETX36 has advantage of being slightly smaller and weight less @ 3lb 11oz and being watertight. both are excellent!