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Hi Umberto,I haven't found a group size 49 compatible battery among Optima's offerings, either (then again, I haven't looked in a while.) I do use a Yellowtop as secondary battery in the LR4, though. As main battery I replaced the pokey stock Varta flooded cell with an Exide Edge FP-AGML5/49 a little over a year ago, no complaints thus far.