Disclaimer: Disassembling your device may void any remaining warranty (unlikely for a 2012 model) and carries a risk of damage. Proceed at your own risk.
Flip the laptop over (bottom side up).
Note: If your battery is swollen (a common issue with age), do not force it. If it is bulging, carefully pry it out, but be extremely careful not to puncture the battery cells, which can cause a fire. t430s disassembly
On the right side of the laptop, you will see a small screw with a keyboard icon next to it, located near the back edge. Disclaimer: Disassembling your device may void any remaining