This circuit protects the battery from “over charges” and “over discharges.” Both are situations you want to avoid. 18650 protected batteries have an electric circuit embedded within its packaging. As a rule of thumb, we always recommend using protected 18650 batteries. There are two types of 18650 batteries: protected and unprotected. As of 2011, lithium-ion batteries account for 66% of all portable rechargeable battery sales. There’s a very good chance you own many products powered by 18650 batteries, whether you realize it or not. Today, lithium-ion batteries dominate the battery industry and have become ubiquitous in many household products we use everyday. Each of these changes resulted in a more efficient battery and in turn, a higher demand for their use and applications in the market. (Neverman et al., 2020) Since then, tweaks and enhancements have been made to extend the output and lifespan of the battery. The very first lithium ion battery cells were mass produced and sold by Sony. Then in 1991, a team of researchers and scientists named John Goodenough, Rachid Yazami, and Akira Yoshino worked together to develop and bring to market the lithium ion cell. His pioneering work to create the first version of the lithium ion battery then set in motion decades more research to finetune the battery to be as efficient and safe as possible. The lithium-ion battery was first invented in the 1970’s by an Exxon researcher named Michael Stanley Whittingham. Learn more about caring for and enhancing the life of your 18650 later in the article. However, this is not recommended practice, as overtime this will cause long term damage to the battery and affect its overall performance. It also has a high depth of discharge, meaning that the battery can be drained all the way down to 0% and still have the capacity to fully recharge the battery. ![]() ![]() Hence why these powerful little batteries are utilized in more complex, power-hungry electronics that require a constant, high level of power for operation. 18650 batteries are what would be considered a “high drain battery.” This means that the battery is designed to generate high output voltage and current to meet the power demands of the portable device in which it is being used. (Osborne, 2019) These batteries are used in flashlights, laptops, electronics and even some electric cars because of their reliability, long run-times, and ability to be recharged hundreds of times over. The 18650 battery has a voltage of 3.6v and has between 2600mAh and 3500mAh (mili-amp-hours). For scale, that’s larger than an AA battery. The name derives from the battery’s specific measurements: 18mm x 65mm. What is an 18650 Battery?Īn 18650 battery is a lithium-ion battery. ![]() We put together a complete list of our most frequently asked questions about 18650 batteries to help you understand how to get the very most out of your Fenix light and battery life. Between different brands, strengths and confusing names, it can be easy to get lost when trying to research different types of rechargeable batteries and how to best care for them. We get a lot of questions about the difference between rechargeable batteries and common one-time use batteries like AA & AAA batteries.
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