The Lifeline GPL-31XT is a 12V 125Ah (C/20) AGM battery in the same BCI group 31 case as the 105Ah GPL-31T.
Dimensions are 12.90”L x 6.75”W x 9.27”H and 74lbs (328mm x 171mm x 232mm and 34 kg)
Lifeline AGM batteries are among the best lead acid batteries available.
They are manufactured in California by Concorde Battery. When you choose Lifeline, you get high quality construction designed to last many years in deep cycle usage.