What is the battery capacity of my BTH12 headphones?

The nominal capacity rating of the integrated rechargeable lithium-ion polymer cell inside the earphone is 650 mAh, which is designed for continuous playback up to approx. 14 hours at a volume level between 70% and 80%. (Page 9)

From the official Iclever Bth12 Wireless Kids Headphone manual, page 9

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