It was my understanding that ALL battery caps have the flame arrestor ability.  Jim Drizos (spelling?) at Trojan Battery told me to always leave the caps on and never loosen or remove them for EQing--they are designed to vent at all charge rates and must be in place to prevent such a flash back.

    BTW, if reduced watering is NOT their intent, why are they called such?  Why not "Flip Top Easy Access So You Can Add Water And Your Batteries Wont Explode" Caps?

    Guess I better keep wrenching those wires and leave the marketing to the smart guys....

----- Original Message -----

From: Tom Lane

..... The Hindenburg's hydrogen did not explode, the hydrogen flashed out. The skin of the dirigible caught fire. The only people who died were the ones that jumped from 200'. EVERYONE who rode the Hindenburg to Earth lived. However, a hydrogen flashback into a battery CAN cause an ugly explosion - Water Miser Safety Vent Caps prevent this.

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