I only buy H-D branded batteries and I am the LAST person to source anything from a dealership first.
I'm well aware they are made in the USA by East Penn Manufacturing, aka DEKA.
The H-D branded batteries seem far longer-lasting than any other in my experience and as I have often stated on here, I *understand* (never seen proof) they have extra built-in protection against voltage spikes caused by regulator or stator failure - one of the most common causes of H-D breakdowns. I could very easily believe that H-D has them built to a certain specification in this regard.
I spent years trying out cheaper/smaller/brand X batteries on a kickstart-only 4spd Evo and eventually went back to H-D. I only use H-D on my Shovelhead and on my Road Glide, but yet to need one for the modern tourer yet after 31,000 miles.
Everybody is free to try to save sixty quid wherever they want. I choose not to on the most critical part of a very expensive motorcycle.
(PS: my local indy parts store, in business 38yrs, ONLY sells H-D branded batteries. The guy who runs the store, a Pan/Shovel man with decades of riding experience and parts-selling know-how, is firmly in agreement that they are theD batteries are good and I can't argue that they do seem to last longer, but it you