Frank,Casa Escarlata Robles Too said:Paul I don't know what the real difference is between the two but the MR series seems to be a good one for RVs solar.
The price has gone up about $25 since I bought mine last June.
Still a good buy.
Frank
Just got my MR127 yesterday and dropped it in today. Had trouble finding a battery box to fit the tight space in my configuration, but found one at West Marine that was perfect once I hack sawed the end handles off. I called VMAX again before ordering and the rep said the MR series has a bit more cold cranking amps than than the SLR. Don't know why one would need more CCA but hey, they make it and it could be a factor for some application. Thanks for the recommendation!
Paul