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power struggle
SLA batteries are pretty good for keepng their charge. Need a minimum of 40 amp hours, but preferrably much more. Started with a 7 A/H SLA for the ETX, but found it simply did not have enough juice to go more than a couple of hours. I now use a marine grade battery, 75 amp hours. It is rather heavy, but running out of juice is worse. My backup is a 17 A/H booster type for car batteries.17 A/H is just enough to power a scope only for the night. Very important, turn equipment off at the switch before disconnecting the battery- just pulling the plug can give a big power spike, potentially blowing components.
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