Lithium polymer, Lithium ion battery and LifePo4 battery packs

  18650 battery which side is positive and negative What is an 18650 battery? An 18650 battery is normally a lithium ion or lifepo4 battery. The height is 650mm. and diameter is 18mm. As we can see from the dimensions. The 18650 battery is named from its size. So, if any cell rated this size, we can call it 18650 cells.    All battery cells with positive and negative pole. Same for 18650 battery cells . but we should have different way to find out the positive and negative pole of it. This is very important to know before you insert the battery to the device. Wrong setting would lead a fire or other problem if there is no protection circuit. Check by sight. We can find out the positive and negative by just see it. The flat side is negative most of the time. and top bottom side is positive. This a normal design as most of the battery cell like this. However, this is not 100% for sure. Because sometimes both sides are flat . And some batteries positive and negative jus...

  Residential lithium battery storage 5kwh or 10kwh     There are many regions in this word still lacks of electricity. While we don’t have insufficient on grid electrics, most of the house owner will select a solar energy system for the residential. A solar energy system is normally included PV panels, invertor, meters and also battery storage system. The battery storage system is obviously so important for on grid /off grid residential energy system. What is the voltage should we use? and how many powers we use set up for our house? Many people are getting confused from internet information. Here let's make it easy understanding and make a best comigration for our personal residential battery storage system.   Select the right voltage. As we all know, in the market, there are many different voltages for solar battery storage systems. especially for home. But generally, we can find out it to low voltage and high voltage battery storage. Here we can lis...