Discharging and Charging – To get the max life from your battery, we recommend keeping it within a range of 3.0V – 4.0V. If you are running your batteries hot, this will certainly cause premature aging. Temperature – Lithium ion batteries will age at an accelerated rate below 0C or above 45C. The following tips are suggested to get the most life out of your 18650 lithium ion batteries. 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. The first thing to consider when choosing an 18650 battery for your device or project is the battery brand.
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