10w takes 2 hours to charge 20,000mah.
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The normal conversion rate of the charging treasure is about 75% (if you feel that the conversion rate of the charging treasure is low, it is generally a virtual capacity), that is, a charging treasure of 20,000 MA, which can charge the electricity of the mobile phone is about 15,000 Ma. The specific algorithm is about as follows: if your mobile phone battery is 4000 mah, that is 7500÷4000=1.875 times or so, if the mobile phone battery is 2000 mah, that is 7500÷2000=3.75 times or so, as for how long it takes to charge the charging bank, It depends on the size of the plug you use. For example, the 2a plug is much faster than the 1a plug.