About choosing the delivery time for delivery from the Poland warehouse
Tips:Your package may arrive late
Dear AliExpress Member, Products from our are arriving in warehouses later than expected due to the high volume of orders and the current global situation. As a result, your 3-day delivery order will arrive later than the estimated arrival date. If you are willing to wait, please extend the delivery time by about 5 days，Rest assured, your order is on the way so please wait patiently before deciding to request a refund. If you are unsatisfied with the delivery time, we encourage you to contact the our for a refund. Thank you for your understanding.
Please Note :
1.The Power bank The labeled core capacity is 20000mah/3.7V , the rated capacity is13000mah/5V.
2.The Power bank The labeled core capacity is 10000mah/3.7V , the rated capacity is 6500mah/5V.
3.We offer two kind programs for you, you can choose according to your needs.
①:PD power bank【Fast Charging QC3.0】 (Orange)
②:Power bank【Ordinary Charging 5V/2.1A(Green）
Q: Power bank has two regular standard of capacity , one is the battery capacity, one is the rated capacity. The 20000mah power bank, being labeled 20000mah/3.7v core capacity be converted to rated capacity 13000mah/5v.
Why exist this happening?
A:The most important reason is the conversion rate. Because most of power bank’s battery voltage is 3.7V, and power bank needs to increase the voltage to 5V when charging the mobile phone, which making the power bank’s conversion efficiency only 3.75/5=74%, Also include generated heat when battery voltage boosting, and various of wire consumption, Electricity and self-consumption. these points add up to account for 30%-40% of the power of the mobile power source.So the 20,000mAh power bank can really be used by us only about 13000mAh.
This link has three different models, please choose according to your needs, do not buy the wrong product.
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