Lithium Ion battery and lithium polymer battery

Mobile charger consists of battery cell, circuit board, and housing.The safety of product is determined by the quality of battery cell and circuit board. Currently the portable charger that are being sold in the market normally use either 18650 battery or Lithium Polymer battery.

What is Lithium Ion battery? Lithium Ion battery are used in most of the portable battery charger in the market,the one that most commonly used is 18650, this cylinder shaped battery is 18mm in diameter and 65mm in length. The cost of using Lithium Ion battery cell is very cheap, but it comes with high risk of explosion when battery is overheated or being squeezed. Unfortunately, there are still many illegitimate manufacturers using inferior/defective/recycled 18650 power bank in their products which could be a huge potential safety hazard to the consumers.

What is Lithium Polymer battery? Lithium Polymer battery is in a colloidal state, so only in certain extreme situations the battery could be swollen or deformed but will never explode, and because it is much safer than Lithium Ion battery, with the same capacity, the cost of a Lithium Polymer battery is several times higher than that of a Lithium Ion battery. The importance of having a high quality circuit board in a portable charge for smartphone A circuit board which is rationally designed and strictly tested plays a very important role in ensuring the safety, it can stabilize the output voltage, can charge almost any cell phone and other digital devices. For instance, the iPhone4S battery voltage is higher than iPhone 4, so a portable charger with a poorly designed circuit board may charge iPhone4 just fine, but when it charges an iPhone4S, the charging could be interrupted from time to time. Apart from the above,a good quality circuit board should has the following functions: Over charge protection / over-discharge protection / overvoltage protection / over current protection / overload protection / high temperature protection / short circuit protection In order to minimize the production costs, those illegitimate manufacturers would probably compromise on these functions which could cause serious safety issues.