What type of batteries are used in airline planes?
From this Concorde battery page, the Embraer E-145 can use a 44 Ah, 24 VDC Lead-Acid batter: Concorde RG-422

The Embraer E-145 can also use Ni-Cd batteries.

The Boeing 777 uses Ni-Cd batteries as well: Boeing 777 Saft Batteries