Can You Put a Nintendo DS Lite Inside a DS Shell (SP)? No—Completely Incompatible

No. The Nintendo DS Lite and the Game Boy Advance SP (often abbreviated "SP") are completely different systems with incompatible:

• Dimensions (DS Lite is wider, thinner, dual-screen).
• Internal layout (motherboard, battery, screens, cartridge slots).
• Hinge mechanism and button placement.

There is no "DS SP" model. You may be confusing:

• Game Boy Advance SP (clamshell GBA, 2003).
• Nintendo DS Lite (clamshell dual-screen, 2006).

You cannot swap shells, boards, or screens between them. Each is a distinct hardware platform.