Today I built the battery box for the 4 Discover EV31A-A batteries in the far rear of the Honda. From start to finish, it took me about 9 hours, not including breaks! My wife was helping me for about the last 3 hours, too. The tasks included: Unwiring the 4 batteries and removing them from the car. Cutting a 1/2" styrofoam sheet to go under the 4 batteries. Wiring up the 4 heater pads and the thermostat. Mounting the heater pads in the car. Replacing the 4 batteries. Cutting and fitting the styrofoam walls of the box. Fitting a lid. Wiring the batteries all back up. Mounting the thermostat. Cleaning up.
Now all of my battery racks are running at a nice toasty 90'F!
Some pics:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-nolrEAR4l_zY8ELfJa3XdbLEpsFI572AogFimS7u3sfigL6ye6JVHGAJYhDtKEG7lNIskJP_LG5uL4dpXajsesxK4zRowurlrzbO7BvOVrYcZhTu81Nnrwt2oQfqqZ7hDGqvSVXtF3U/s320/BattBox1.jpg)
The box, about 1/2 finished, putting together an inside corner.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeFGWDFrI2mm6G3WJTJd9kLMJYo7ecRj0Hz0jFNCks9EGFwZC9t16AeRYyPxR1br9VoT9DLCeguyrulPT6XM05mq0odOYyU7eUFrdORV2wFBKhmemlWWPk_kbA6fGZDasCb94geC1Zu1M/s320/BattBox2.jpg)
The corner after it's been slid into place
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWLxQljlLlFkYmc3f-F7-hUF_vuYms_-bJNOLM_uLj_obNYQWJ0SpeDpxaqzlipcVWA-3443QmNJELuh-M2Go96G4XFAsaWFygckDMbNwX33dMgJtOnGy8MXdvCWBRfHP-AHwDzV4n2Lw/s320/BattBox3.jpg)
Buttoned up with the cover.
[Yes, I remembered to get the scissors out! :-)]
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCR57g3MJky5_Ytf-ut0tOyV8x3jLoju__meOithAI9H1lxWzXRQYTVRYTOlnLSH7vCk2Fwfx09xSd5yE-A7UT-6cMik_caQcWbF0W_pLdoESbH6cIu6Am5OA0ACZ-saxwNI131yaDpP0/s320/BattBox4.jpg)
The thermostat hides under the block sticking out. Hot water heaters place their thermostats under the insulation, so that the entire body of the thermostat heats to temperature. I mounted the thermostats on the batteries the same way, surrounded and covered by insulation.
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