Just can't get MK1 Prius going, any help anybody???

Hi there fellow prius drivers!

I have trouble getting my MK1 (0) prius (1998) going.

It's been sitting for the last year and a half unstarted... (I know, bad idea..)

Now, I've added a new 12 volt battery, filled up the gas tank and cleaned the MAF.

I have after several non-succesful attempts, finally succesfully tried the NiMH battery charger that is build into the car in the boot. First 5 or so times it came back with "fault".
I persevered, and suddenly when I long pressed the button, it went "charge". This lasted for 10 minutes or so and then the light started flashing green.
I thought "great", just start her up now!!

But got disillusioned when I turned the key repeatedly, but no action. The square appears around my "P" indicator as it should.

I also tried starting by putting the car in "D" and pressing the accelerator, to no success...

Anybody out there that has any further ideas on how to get the old girl moving again please??

Regards, HUGO
Australia