ROMOSS Sense15 15000mAh Power Bank Portable Power Bank External Battery Pack Power Bank For iPhoneX
<div><div> <img alt="FREE SHIPPING!!! 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Higher end power banks possess around 90% conversion rate. Power bank conversion rate is also related to batteries used in the production. Lithium-polymer rechargeable batteries have a work output conversion rate that is generally 85% -95%， </span></span> </div> <div> <span style="font-size: 14.0px;"><span style="color: #ff0000;">and lithium-ion (18650) battery possesses an output conversion rate between 75% - 90%. </span></span> </div> <div> <span style="font-size: 14.0px;"><span style="color: #ff0000;">To calculate conversion rate with the real capacity and charging times you do the following:</span></span> </div> <div> <span style="font-size: 14.0px;"><span style="color: #ff0000;">Smartphone charging is dynamic of around 500MA-1000MA with the voltage at 5V.</span></span> </div> <div> <span style="font-size: 14.0px;"><span style="color: #ff0000;">If the battery power is marked 4000mAh， then the power of a 4000mAh power bank should be 4 * 3.7 = 14.8W， </span></span> </div> <div> <span style="font-size: 14.0px;"><span style="color: #ff0000;">calculate by our polymer batteries conversion rate of 80%， the real total power supply for charging can be 11.8W. Take a 1500mA smart phone for example， </span></span> </div> <div> <span style="font-size: 14.0px;"><span style="color: #ff0000;">the demand power is 3.7*1.5 = 5.55W， then it can charge the phone two times. So if you want to charge your tablet， you need a larger capacity power bank， </span></span> </div> <div> <span style="font-size: 14.0px;"><span style="color: #ff0000;">the power bank capacity should be more than 8000MA and can provide high current 2A output charging requirements.</span></span> </div> <div> <span style="font-size: 14.0px;">If you have any questions， please contact our customer service ， we will reply to you as soon as possible</span> </div> </div> </div> <div> </div> <p style="font-size: 12.38px;"> <img alt="FREE SHIPPING!!! 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