Hmm...now you got me to thinking. After some reading, sealed batteries really aren't "sealed".
NHRA Section 8.1 Rules say:
http://www.nhra.com/UserFiles/file/G...egulations.pdf
All batteries must be securely mounted; must be of sufficient
capacity to start vehicle at any time. Batteries may not be relocated
into the driver or passenger compartments. Rear firewall of .024-
inch steel or .032-inch aluminum (including package tray) required
when battery is relocated in trunk. In lieu of rear firewall, battery
may be located in a sealed .024-inch steel, .032-inch aluminum, or
NHRA-accepted poly box. If sealed box is used in lieu of rear
firewall, box may not be used to secure battery and must be vented
outside of body. Relocated battery(s) must be fastened to frame or
frame structure with a minimum of two 3/8-inch-diameter bolts.
OEM located batteries without complete OEM hold-down hardware
must be secured to OEM battery box/tray using the same 3/8-inchdiameter
bolt hold-down method described in previous sentence.
(“J” hooks prohibited or must have open end welded shut.) Metal
battery hold-down straps mandatory. Strapping tape prohibited. A
maximum of two automobile batteries, or 150 pounds combined
maximum weight (unless otherwise specified in Class
Requirements), is permitted. Maximums may vary according to
Class Requirements.
So given the in lieu of a rear firewall...I'm thinking something like this may work:
http://www.amazon.com/NOCO-HM424-Sea.../dp/B006VU5W92
Which is just like Jegs sells which is identified as NHRA approved:
http://www.jegs.com/i/JEGS+Performan...10230/10002/-1