I. Security Trap What is the most important factor to consider when purchasing mobile power? Many friends will say that it is battery capacity, all wet! Even batteries can explode, including the safest lithium polymer battery. It can only be said that the possibility of an accident with this battery is very small, and no one can guarantee that 100% will not have an accident. Some people say that, for example, the explosive power of a 4000 mAh battery is equivalent to a small Grenade, which is certainly not alarmist. After all, the frequency of cell phone explosion accidents is obvious to all. In order to occupy the market at a low price, some manufacturers try their best to reduce costs, use inferior batteries, or recycle used batteries of notebooks. How low is the price of such a battery? Sell by the ton, you get what you pay for, so you don't need to explain how safe it is, just think for yourself. Safety is not only reflected in the battery, but also in the circuit board. Many manufacturers shout the slogan of "safety", but they can't explain why. In fact, the protection mechanism of mobile power supply is mostly responsible for the circuit board. Generally speaking, a good circuit board has three protection functions, namely overcharge protection, overdischarge protection and overcurrent protection. If the battery is compared to a warehouse for storing electric energy, the circuit board is like a warehouse manager, strictly controlling the input and output of current. The output current of mobile power supply is not constant, that is, too large current or unsaturated output current (too small current) will cause great damage to the battery. Therefore, when buying a mobile power supply, you can't just listen to how the business blows. You must recognize whether there is still a flicker behind the flicker! Second, the virtual standard of electricity is serious and the conversion rate trap is deep. According to the evaluation given by computer newspaper recently, the actual capacity of many well-known brands has not reached the nominal capacity, and some products are even far from the nominal capacity. The conversion rate of 90% was blown all over the sky by some businesses. In fact, this is absolutely misleading consumers. Imagine that the best conversion rate in this respect is 82%. Everyone knows how deep the water is in the conversion rate. 90% or even 95% is nothing. It is actually very simple to know whether the business is lying. If you buy a product with a nominal capacity of 4000mA and a conversion rate of 80%, the effective power that can be input into the mobile phone is 3200mA, and the battery capacity is1200mA, then this all-mobile power supply can charge the mobile phone at least 2 to 3 times. If you can only charge it twice, it's a pity that you have been cheated. Third, the price system is chaotic and there is a big gap between online and offline. For some products with good sales at present, the price of the same product is different and the gap is not small. A 2000 mA mobile power supply is priced at more than 400 in the physical store authorized by Apple, and it needs 360 after discount. The same product only needs 100 on Taobao. Such a big price difference makes parents who buy in physical stores feel distressed, and also makes online shopping worry about whether they have bought knockoffs. Therefore, products with uniform online and offline prices can reassure our consumers. So be sure to check the prices of various channels before you start. If online shopping is similar to physical stores, you can consider it more. Generally speaking, if a product can use qualified batteries, its capacity is solid, and its price can be unified online and offline, it is a good product. If you need to start, please keep your eyes open and shop around, so that you can buy genuine treasures.