Best AGM Batteries

Battery life is based on cycle count (how many times the battery is discharged and charged).  Battery construction and type material used for the plates helps determine some of that.  Battery use and maintenance determines the lion's share of the life.  In use, the deeper the battery is discharged, the less the cycle count.  A battery discharged to 25% won't last half as long as one only discharged to 75%.  Then comes the charging.  The most misunderstood part of battery maintenance and the one biggest causes of batteries premature failures. 

I'm not going into any details on this because everybody seems to have their own thoughts on this.  Thoughts on what charger to use and how they should be charged, even though many are wrong.  Most have the mindset; they bought the best, or a cheaper one that's just as good as the best, or a charger only charges the battery so the type charger does not matter.  A few do get it right, but many are wrong.