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How many hours can you use the battery of Whisper Flex (ultimate) until it runs out?

This depends on which battery model you have. For the 4400mAh version, the following applies: Mode Oscillation Battery life* 1 Switched off 8:20 hours 1 Horizontal or vertical 5:10 hours 1 Horizontal and vertical 3:30 hours 5 Switched off 7 hours 5 Horizontal or vertical 4:10 hours 5 Horizontal and vertical 2:50 hours 10 Switched off 5:30 hours 10 [...]

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