Electronic key not working / car not starting

[jo_my_gosh]

Hello there,

New to these parts / and also DIY car maintainence so really hoping for some inspiration / help if that is ok!

I went to open my Yaris yesterday and the electronic key was dead. I opened it manually but when I went to turn over the ignition there was nothing. Tried lights - nothing.

I am thinking initially that it may be the battery - but then wondered if some connection between key not working and the car not turning over at all.

Could this be that I need to reset key or electrics?

Id appreciate any help you can offer - Id love to be able to try a few things out before having to try getting it to garage.

Thanks in advance,

Jo