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Heat is the enemy of battery life.

Our 9-5s from 02-up are equipped with a passive air cooled battery box. Great while underway. What happens when stopped or just after the engine is switched off? Heat soak.

This is an easy mod using Dynamat hood liner and some foil tape.

The foil helps reflect radiated heat and the foam assists with the convective heat transfer after shutoff.

Enjoy. 20200418_125925_HDR.jpg 20200418_125910_HDR.jpg
 

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Interesting. My '02 Aero has one and I only believe it is there as a cover.
But that's just me, I try not to over think about things like that.
 
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