My OEM Panasonic was still going strong when I replaced it at seven years. I had already installed a dual battery system prior to this. So if the OEM suddenly failed I had back up.
I usually change out a battery at 4 to 5 years but I wanted to see how far this Panasonic would go. Seven years was all I was willing to go. I replaced the primary battery with the Odyssey AGM.
Its been in 3 years without without any issue. The secondary battery is a optima AGM and its 5years old. this is the battery I run all my mods off of. also no issues.
I read on this forum about how optima has gone down in quality. I don't find that to be true. I have used these in my boat for years with out issue. but they are well maintained.
Recently My wife's 2016 Subaru outback battery failed it was out of warranty but the dealer replaced it at no cost. My curiosity got the better of me and I googled it, seems Subaru had issue with the OEM batteries.
they never issued a campaign as it was not a safety issue but did free replacements for customers. Good PR.
As many have said its all about the environment and maintenance to keep your battery at its peak. but sometimes it fall back on to the manufacture.
It's interesting to me that you all are saying the OEM batteries are made by Panasonic. I never knew that.
I retired a year ago as an Independent Sales Rep and I had Panasonic Cordless Tools as one of my products for 10 years. Of course these batteries were Lithium Ion batteries vs Lead Acid in our trucks.
Since I had Panasonic's largest user in my territory, John Deere, I worked directly with their top Engineers. About 6X/year these guys would come to the Combine plant in East Moline, IL to work on prototype tools. This was the closest plant from Chicago, so they keyed on this one. These guys were SCARY SMART but very modest. They weren't salesmen so never promised anything. They simply took notes. More times than not, those Notes became reality. I'm talking about functionality of the tool, not the battery. Although 2 instances the battery came into the picture. Mostly the Charging Station.
10 years ago Panasonic was #2 in sales dollars in Lithium batteries. Sanyo was #1. Panasonic bought the Sanyo Lithium Battery division, making Panasonic far and away the largest manufacturer of Lithium batteries. Tesla in the news gets credit for their Hi Tech battery research. LOL Those batteries come from a Panasonic plant.
That's some of the background.
Even though earlier I said basically, batteries are batteries and come from common manufacturers no matter the brand?
I'm thinking, when my 2021 battery craps out, I'm going back to the Dealer for another Panasonic.
Certainly if this one craps out in 3 or 4 years, I'll eat my words. Get that.
I trust them, and most wouldn't believe how much B2B business Panasonic is involved in. So much so that it won't be long you will have to work hard to find a Panasonic Logo on any product. They don't promote the Panasonic name/brand. They promote their Solutions to OEM manufacturers.