It is a good idea to copy the BIOS settings before you replace the battery. But I'd replace it at the same time you install the SSD. You don't want the battery to die while you're in the midst of this upgrade. Reboot and immediately start tapping F2 to open BIOS setup. You don't want/need to buy a Windows DVD. Who knows how old it is and what version it is? Get the latest version directly from the Microsoft site and follow their simple instructions to create the bootable USB. Why spend $ when you don't have too? Better to use the bigger USB stick, but be sure you don't need anything that's on it now, because all those files will be deleted. You can use any Windows PC to create the USB. Just follow the instructions for "installing on a different PC" that Microsoft has right there are on that page.
My hard drive crashed on my Inspiron One 2330 and I regretfully did not back it up. My Service Tag is . The warranty expired 24 Feb. 2014. The OEM software is Windows 8. I updated the software using MS updates to Windows 10 when MS offered it to existing Windows 8 users. I’m installing a 2TB Samsung 860 EVO SSD to replace the 1TB Seagate HDD. My questions are: 1.) Do I need a Dell Windows 8 recovery media installation DVD 64-bit or do I need  Windows 10 recovery media installation DVD? 2.) Can Dell provide me the OEM installation DVD’s? I know the MS Windows Key is embedded in the system bios on the motherboard. Thank you for your help. Your assistance is sincerely appreciated! 
Dell Inspiron 2330 Windows 8