I don't see a jumper or a battery on this board. Nothing that looks remotely like a battery can be removed (everything is soldered). And I am not sure which, if any, jumper/solder pads can be shorted to wipe CMOS (read on for further details about this).
Update: Matt located a pair of solder pads marked "reset." I shorted the circuit several times, but the password prompt still remains.
![Toshiba Satellite A55-S1065 CMOS reset jumper](https://cdn.statically.io/img/i.sstatic.net/BUOTW.jpg)