These are very slim, extremely light weight batteries based on the new Polymer Lithium Ion chemistry.
This is a VERY common regulated 12 VDC 2000mA output power supply used for many common gadgets.
This 3.6V 280mAh rechargeable Ni-Cad battery contains three cells in a right triangle configuration.
This 3.6V 300mAH rechargeable Ni-Cad battery contains three cells in a triangular arrangement
The Adapter, 16V @ 500mA is a economical power transformer that supplies 16V at 500 mA output.
6 Vdc, 1.5 Amp power supply with center positive polarity.