I guess yu are one of the chosen few. With bad luck.
Most of these Panasonics are workhorses with little complaints. Most honest Dealers will admit this too.
And although they are labled Maintenance free, the Panasonics, if they are checked and serviced and filled with distilled water as needed and
most importantly NEVER DEEP cycled, they will go better than 5+ years.
But, I always reccommend a new battery every 5 years anyway for peace of mind.
Everyone, has different driving habits and vehicles are used in different climates. Hot weather is a battery's nemesis in my opinion and I feel Sealed Cell
TRUE Maintenance Free type designs are better than open cell(refillable) batteries in hot regions.
BTW, automotive batteries are regionally designed for either Hot climate areas or Cold climate areas depending where yu purchase your battery or vehicle when it is new.
Say, yu buy a replacement battery in Southern Texas on your summer vacation trip, but yu live in the northern States (cold region, that battery will not last as long as it should and vice versa; if yu purchased a battery in the Northeast cold region and yu live year round in southern states, that battery will also fail prematurely. Battery MFRs. build them like this. And I experienced this first hand years past. It all has to do with Cold cranking Amp Capacity designed with specific anticipated
ambient temp. conditions .
I could go on and on about battery technology....
Enough blab from me.
LT