Please refer to our battery safety guide for these tips. There are many safety precautions that should always be taken when using, handling and/or storing lithium ion batteries. ![]() For these reasons, we use the CDR rating which is the current rating at which the battery can be continuously discharged at safely without overheating or damaging the cell. We avoid using any pulse ratings as there are far too many factors to consider when pulsing a battery such as pulse length, time at rest between pulses and battery temperature to accurately compare two batteries. Pulse Rating - The maximum current at which the battery can be discharged for a short period of time without damaging the battery or reducing its capacity. Pushing a battery to limits beyond it's ability will greatly increase the risk for battery failure. CDR – The maximum current at which the battery can be discharged continuously and safely per manufacturer testing without damaging the battery. Those terms are continuous discharge rating (CDR) and the pulse discharge rating (Pulse). There are also two terms you should know that are discussed in battery current ratings. If you choose a battery with a current rating less than what you need, you will notice the battery overheating as it is working beyond its ability to keep up. You need to know how much current the device you are trying to power requires before choosing your battery. This is probably the most important thing to consider when selecting a battery. If you see any 18650 battery marketed above these specs, you should be very weary of what you are actually getting as it is absolutely certain to be false and exaggerated. As of 2021, there is not a single 18650 lithium ion battery rated above 3600mAh capacity or a 30A CDR. There are various other unknown brands with all sorts of unrealistic ratings. As well these brands often include a battery carrying case with all of their batteries. They do often provide value by using a thicker PVC wrap on the battery which provides an extra layer of protection. It should be noted these companies do not actually produce their own lithium ion battery but instead purchase them from other manufacturers and then wrap the battery and add packaging to make the battery suitable for retail sale. These brands tend to slightly exaggerate the battery ratings for their products in an effort to appeal to the consumer and sell more. Other brands such as Efest, Vapcell, Imren and MXJO have been established for a few years and their quality has certainly improved. You will often see the battery outperform the manufacturer ratings put forward from these brands. Any manufacturer specs provided by these brands is well documented and tested many times over. These brands are well established and have long standing tradition, values and standard to uphold. There are five major brands that manufacturer batteries who you can rely on to provide quality, consistent and truthfully rated batteries and those brands are LG Chem, Molicel, Samsung, Sony|Murata and Panasonic|Sanyo. Thankfully, there is a watchdog in the lithium ion battery industry known as the battery mooch who provides thorough testing and will call out these companies for their unlawful practice. This practice of exaggerating battery specs is unlawful and can be very dangerous to consumers if gone unchecked. The goal of any manufacturer or brand is to sell as many batteries as possible but some companies have been known to exaggerate their ratings to appear to offer a better product than the other. This is especially true when discussing the Chinese re-wrapping brands. Not all brands are created equal and often times you will find are not very truthful in their battery ratings. ![]() Measured weight (without heat shrink tube): 68.The first thing to consider when choosing an 18650 battery for your device or project is the battery brand. Using 1.6A/0.33C charge current with 242.5mA/0.05C cut-off and 4.85A/1C discharge with 2.5V cut-off after 1000 cycles the capacity should be ≥3880mAh (80% of std capacity).ĭC IR at 4.85A in fully charged condition was 20☑mΩ (measured using EB Tester Software's Resistance test feature). Samsung 50G has the following specs according to its official datasheet ( pdf): There is also a 2D matrix code and 2 other markings: The printing is not resistant to ethanol-based degreasers and is washed away easily, so if you're going to put a tube on 50G be careful while degreasing the cell surface. Samsung 50G comes without any heat shrink tube on it and all the markings are printed on the cell barrel. To be sure in results i've done each test minimum twice ( usually 3-7 times). Before each discharging or charging i've held a 1-1.5hr pause. Before each discharging cycle the battery was charged at standard charge current mentioned in its datasheet to charge end voltage. ![]() I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement.
0 Comments
Leave a Reply. |