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I have the newer dremel7760 lite with internal 4v battery. It was given to me as a bag of dremel “disassembled” I put a 18650 battery in to test but it cuts off on high"4" does anyone know what battery is supposed to be in this dremel lite 7760

Looks like the battery is an Integrated Lithium Ion battery and does not appear to be replaceable.

This is what came out of it. Easily replaceable, or even upgradable.