Lenovo T420 - Manual (Page 134)

Bottom view
1 Battery pack
2 Battery pack latch
3 DIMM slot
4 Docking connector
5 LCD cover latch
6 Serial Ultrabay Enhanced lock latch
7 Serial Ultrabay Enhanced eject latch
6
7
5
1
2
3
4
128 ThinkPad T420 and T420i Hardware Maintenance Manual