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Sony WH-CH720N headphones with up to 50 hours of battery life launched in India
Sony launches WH-CH720N with noise cancellation, 50 hours battery life at Rs 9,990 - Times of India
How to calculate the Watt Hours (Wh) of a lithium battery – BatteryGuy.com Knowledge Base
Sony announces new on-ear wireless headphones WH-CH520 with 50 hours battery life - Mobility India
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Watts in a Name? Why We're Using Watt-Hours to Compare Batteries | Wirecutter
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Amazon.com: Sony Wireless Bluetooth Headphones - Up to 50 Hours Battery Life with Quick Charge Function, On-Ear Model - WH-CH520W.CE7 - Limited Edition - Matte White : Electronics
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