Shenzhenbuji mobile power supply manufacturers - Swiss factory direct moving forward and power forward and Swiss mobile power is a professional mobile power supply manufacturers, professional development production and sales of mobile phone charging treasure Apple mobile phone accessories. Mobile power actual conversion rate calculation method Recently, many online users are asking: how I 5000mah mobile power to charge twice iphone4 can not ah! Iphone4 friends know with lithium battery 1420 mA, intuitively, 5000mah mobile power can charge for iphone4 3.5 times ah! How the two can not ah! In fact, this method of calculation is wrong, because the mobile phone has a loss of power with many of my friends do not know the conversion rate of mobile power is calculated. Principle of mobile power is the standard battery voltage 3.7-4.2V, boost to 5V, and then be able to charge the phone, the phone itself has a charging circuit, the two will have a loss. We usually say that the mobile power capacity refers to the capacity of the batteries. Mobile power to charge the phone in the process of moving the power board will loss its power adapter is also power, while the phone itself is power! The conversion rate is commonly referred to as mobile power = (actual discharge capacity * average of discharge voltage) / (actual capacity batteries * batteries voltage). Because the phone's battery standard voltage of 3.7V, mobile power batteries standard voltage for 3.7V. Many people will ignore this voltage! Remember this when calculating the voltage of the batteries to be considered. Laptop battery voltage 14.8V, 19V range. The actual amount of discharge electricity here is that its release of electricity, not the final phone available. Mobile power capacity = actual output power capacity of mobile power conversion efficiency × × mobile phone charging efficiency * adapter cable adapter efficiency power conversion efficiency of the general movement is about 80%, a little better able to reach 85-88% conversion of ordinary mobile phone charger efficiency is about 75%, cable adapter loss is generally 10%, then the adapter cable adapter conversion efficiency is 90%, then left 5200MAH mobile power, and ultimately can be fully utilized only phone: 5200 * 0.85 * 0.75 * 0.9 = 2983.5mAh so to see clearly enough to be able to charge twice for iphone4 electricity. 5000mAh mobile power if its conversion rate is not high, then it can not be rushed twice electricity. Shenzhen City Jin and Rui Electronic Co., Ltd. was established in 2006, located in the global digital product development customized production base, is a company specializing in digital products such as speakers, Bluetooth speakers, WIFI speakers, gift speakers, USB speakers, card speakers, portable speakers outdoor speakers, waterproof speakers and develop customized mobile power production plants, from product design to mold injection ID, from the surface of the product to handle the assembly forming one-stop service, the success of help Lenovo / LENOVO, HP / HP, Disney / DISNEY, L'Oreal / L'ORESL gift waiting for name brand custom manufacturing services, the factory about a month to launch three private mode patented products, design patents and utility model patents up to ten balance, professional R & D team and perfect The customer service team allows you to experience my factory anytime you call the shots realm. Sincerely hope to be your production plant in Shenzhen! Shenzhen Rui Electronic Co., forward and invite your support and join. Contact: Guo Rui Tel: 15986605256 Tel: 0755-29570180 Phuket Phuket mobile power mobile power supply manufacturers