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I run my HEQ5 from old car battery that would not crank the engine bur runs the mount and GStar camera whole night.
By the way – there is no point in regulating battery output as it outputs pure DC current that no regulated DC power supply can match. As mater of fact, regulating battery output will introduce some AC noise to it. Only reason to regulate battery output would be if your equipment requires exact 12V DC input. And such a regulators are rare and expensive as they require at least 0.7V difference between input and output, your battery will not last long. At 12.7 V on battery the regulator will drop out of regulation.
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