What is the serial #. If it starts with 322... or 324... then there is an orange light that comes on with the key switch and then there is a Battery discharge indicator with a green, yellow and red light and depending on the charge in the battery one of the lights will stay on when the battery is plugged in. It would take years to drain the battery with either light on.
What do you mean by batteries, it should have one big battery.
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