Just bought my daughter one of these little cars and upon inspection there is nothing holding the battery in the trunk in place. Tried searching but I keep coming up with universal hold downs, any help would be appreciated.
dig around where the spare tire is. some clown may have thrown it in there and forgot about it. otherwise you're probably gonna have to go dealer of junkyard. there aren't even any Prius' in our local junkyard.
Coupla good links: Battery for 2004 Toyota Prius | Toyota Parts Buy genuine battery carrier for Toyota Prius 2 generation 09.2003 - 10.2005 from Japan - Amayama The latter works better for me, being outside the States. Often cheaper too, if you bundle parts into one order, keep it from one country of origin. So far no sales tax or duty levied, with small orders.
If I remember correctly, the entire battery mount assembly can be purchased new from Toyota for about $28. There's two versions, one for SKS cars and one for non-sks. The SKS cars have a slightly larger battery with a S46B24R model and the non-sks uses a S34B20R model. If you have the bottom portion already, which the battery sits on, the top arm is available for about $11 2007 Toyota Prius Battery Hold Down. Clamp, Battery Hold Down. Support, BATTER - 7448047010 | Brewer Airport Toyota, Moon Township PA