Can the battery of Whisper Flex also be used in Whisper Flex Ultimate and vice versa?
This is certainly possible. There are 2 variants (4,400 mAh and 6,300 mAh) that fit into both fans.
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Our products have a 2-year warranty
This is certainly possible. There are 2 variants (4,400 mAh and 6,300 mAh) that fit into both fans.