The Banner battery is very marginal starting the M3W even when it is 100%. There is a list of suggested batteries that fit, in the Alternative Parts List (page 6) that is in the "M3W Owners Resource" at the top of this forum. I have a Magneti Marelli Lithium Ion battery that has been excellent for the last 4 years. If I was getting a new one I think I would probably get the Exide AGM one as it looks good value for the performance and fits perfectly.
