Plastic battery boxes work just fine. My Cardinal has one. Came from Cessna that way.

But it’s located in the tailcone, not the hot engine bay. The plastic would not last long under the cowling.

Further, Cessna 150s cantilever the box off the firewall. A plastic box would not be strong enough for that. It would need support underneath.

Last edited by Kirk; 06/27/19 06:15 PM.

-Kirk Wennerstrom
President, Cessna 150-152 Fly-In Foundation
1976 Cessna Cardinal RG N7556V
Hangar D1, Bridgeport, CT KBDR