15. Battery related matters of the RETRO NANO

Battery
450mAh 3.7V rechargeable lithium battery (compatible with similar 10440 batteries), not compatible with AAA (1.5V) batteries

Battery life
Battery life of about 7.5 hours in AAC encoding format with high gain (3.5mm headphone output)
Battery life of about 7.5 hours in AAC encoding format with high gain (4.4mm balanced output)
Battery life of about 9 hours in PHONE mode

What kind of adapter should RETRO NANO use?
RETRO NANO does not support fast charging. Some fast charging adapters on the market can charge RETRO NANO, but they will not trigger fast charging and are not guaranteed to be fully compatible.
It is recommended to use a general 5V2A charger, which can be fully charged in about 1.5 hours