No. This is one of the oldest tricks in the book.
When I worked for BMW North America, I was in charge of battery field service. I took a trip to the Deta Douglas battery plant, manufacturing BMW branded batteries in the US, to be used in place of "BMW" Varta from Europe. There are very few actual battery plants left, as working with lead and acid is never a first career choice...
The difference between Diehard Silver and Diehard Gold? (which were made by either Johnson Controls (aka Interstate) or Exide) . . .
Nothing. Well, one thing... the Price!
The battery construction and chemistry are the same. The stickers and decorations are fancier. The price is higher, but the warranty is extended. Instead of 12 replaced and 24 more prorated, you might see 18 months replaced and 42 more prorated.
There are no OEMs that make their own batteries, at least that I know of. They get somebody else to do it (Johnson Controls, Douglass, Exide) with their own colors and branding.
With a dealer branded battery, price is liable to be three times as much, with a warranty more limited than a quality (I'm fond of Instersate) "aftermarket" battery. In fact, OEMs are looking to sell a car, not give you a 5-year battery. Battery aftersales have a different agenda.
Only in cases of extremely odd battery shapes and capacities would I consider dealer replacement.
Go to slick deal forums and search for advance auto parts coupon codes. I found one for $40 off online purchase of $100. Buy online and pick it up at the store. I bought a 6 year $105 gold battery for my truck for $65 bucks plus tax. Take your old battery and they will credit your core charge when you pick up the new battery. If you want to buy a cheaper battery there are several codes like $10 off of $30, $25 of $75.
I bought two sets of Wagner Therma Quite ceramic brake pad using the coupon codes and a wagner rebate form found at rock autos web site the pads were around $15 a set.
Coupon code want work if you put in oil products in your shopping cart.