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The suction power largely depends on the number of batteries, one LI-Ion battery stands for 3.6 volts. In this device (14.4 Volt) the manufacturer uses 4 LI-ion batteries. Replacement is possible, a few old batteries (LI-Ion) from an electric bicycle are perfectly sufficient. Buying is also possible +/- 8 € / piece, but a new device does not cost much more +/- 45 € (14.4 Volt). Since extending the lifespan was the goal, I have repaired this device. Ecologically responsible!!