Prius, 08, smart key. Dead on Sunday am --- nothing works. Put trickle on the underhood postive and neg to body bolt. Got enough juice to open rear hatch (and dome light comes on )
Replaced with toyota battery. Neg cable taken off first, then pushed up out of the way behind carpet.
Still dead. Checked both batteries at Autozone. 94 and 100% --- wasn't battery in the first place. Checked clear window fusible link on top of pos post --- still good. Can get locks and lights to work with trickle charge.