The only other battery is the coin cell bios battery. There is only one main battery. See the manual- Dell Latitude E5530 Owner's Manual and see this FAQ - Laptop battery articles - Dell Community
I have dell latitude e5530, so my question is that my laptop supports a second battery? One is already working and in good condition. if I want to and another one so it's possible or not in my laptop.
Dell Latitude E5530 Secondary Battery Support