RR11 support 9V (including) and below charger. It not recommended to use 9V above fast charging adapter for charging. Long-term use of over 9V fast charging adapter will damage the charging protection IC of RR11, and ultimately lead to the discharge problem for RR11.
Since the protocol of fast charging adapters is not unique, it is recommended to use a 5V 2A adapter to charge RR11.
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