Russ, I've been running two xenon strobes in parallel that draw 300ma each from a 7.2Ah SLA battery for a couple of hundred hours of cumulative running time with no problems. They usuallu run 1 - 1.5 hours at a time.
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"Surely one can love his own country without becoming hopelessly lost in an all-consuming flame of narrow-minded nationalism" - Fred Birchmore