The indicator you have for battery condition that came with the rig is called an "idiot light" for a reason. The manufacturers think we are idiots who don't really want to know the charge condition of our batteries. With a proper battery monitor you can know what you are drawing and if fully charged means fully charged. Like a tire monitor lets you know if you are about to have a flat, a good battery monitor lets you know if you are ruening your batteries.....cost effective.
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