Why Is The Battery Manufacture DP Instead Of SMP?

I've owned several Mac notebooks with factory-installed batteries, both DP and SMP. Not a issue. The original Dynapack (DP) battery in my current Macbook Pro is now 11 years old and still has plenty of runtime for my needs. They are properly good batteries.

You have to be careful searching the SMP term. In addition to a manufacturer, SMP is also a technology for power management in rechargeable batteries used by a number of manufacturers. One highly placed search result for "smp" on large.net was rife with errors. Anyone can post anything on the internet.

I used to have the codes for those batteries. All I can find this morning is that the Coconut Battery app translates the "S" to "Simple" which I recall being part of the company name.

Because batteries, like many components if not all, are procured on a bid basis. As long as it's an "Apple" battery, its meets Apples strict requirements.

Apple tends to use two vendors when sourcing parts for its devices so if one of the vendors has a problem, then Apple will still receive parts from the other vendor.