How did you manage to get so much power from such small, lightweight batteries, when those in most other powerful metal detectors weigh 100 to 150 g?

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Despite the battery’s small size, the power of the coil is at least as great as the Gold Maxx Power, for instance.
It is difficult to explain in just a few lines as it involved a great deal of research.
We optimised the efficiency of various elements such as the coils and the amplification stages. There was also the choice of a high-capacity lithium battery and leading-edge electronic components that were more expensive and precise than those usually found in metal detectors.
These highly efficient circuits waste far less power: It'sa little like the ordinary incandescent light bulbs used in the home which are very inefficient,actually losing 80% of their energy as heat; compared with that of LED lighting, which uses all its energy for light rather than heat!