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This applies less when selling B2B. Auto companies and power companies are GOING to shop based on reliability, and are GOING to notice when your stuff doesn't last as long as it should.

I'm referring to the battery companies, who won't bother to increase longevity beyond the bare minimum necessary to meet a specification.

While I doubt something like the Phoebus Cartel exists for batteries, when they all have little incentive to make them last longer, you won't find much difference between them. Exceptions include military and aerospace where the costs are also many times higher.

I think that in the super fast growing market you don't lose anything by making your product last longer. The demand would be larger than supply for a long time anyway. OTOH, it's good to get an edge over competition by offering a superior product.

Battery cartel did exist tho

Not really. A battery that can last longer at a given operation rate also means you could, for example, charge it faster or draw bigger loads.

You can mitigate planned obsolescense with recurrent billing, like monthly fees.