Batteries touch metal chassis and cause sparks?

[JThiessen]

Thats why I'm converting all my "good" stuff to Deans. Still have a pile of cheap stockers that run on your basic 1500's that I'm leaving the Tamiya's on. Back on the thread topic...does the shrink wrap really affect battery temps? I wouldnt think it would amount to much, but then just putting a plastic grocery bag over my emaxx in snow was enough to considerably raise the tmeps, so stopping airflow does affect it somewhat.