Been pokin' around, not found much I can use. Hope this question hasn't been answered before. Run cam where I hace access to AC power, no problem. Need to do some shows with no access. Battery only last an hour. The input for DC is stated as 8.4v, 1.5 amp. What's the smallest, cheapest, answer to my problem? I have no qualms about rigging a cable, just need some advice about the unit. Thanks in advance