Make sure the battery is fully charge. Check all the cells with a hydrometer to make sure it is fully charged, may have a dead cell. If all that checks out then have it load tested. I worked for a battery company and our returns that came back, 50% were new. A defect may not appear till after it is bounced around or has been sitting for some time.
Make sure the battery has the right cca (cold cranking amperage) for your engine requirements, not all batteries are the same.
Don and Jackie
2115 Hurricane 27K
2113 Redhawk
1992 Pace Arrow