How to choose 18650 lithium battery and charger?

There are countless versions of 18650 lithium battery rechargeable batteries with many functions, the most important of which are capacity, maximum pulse and continuous drain current, charging current, protection of electronic devices, etc. The size of the 18650 lithium battery is (diameter x length) 18.6 x 65.2 mm (0.73 x 2.56 inches), or round 18 x 65 mm. The actual size varies slightly from manufacturer to manufacturer, but these small changes in size usually do not cause problems. How to choose 18650 lithium battery and charger Before buying a new 18650 lithium battery, what should be considered? 1. The electrode ends of the 18650 lithium battery are flat and button or side. Most devices support the use of these two types of 18650 lithium battery, capacity and maximum discharge current-these two values u200bu200bare closely related, because the high capacity design limits the maximum safe discharge rate, and vice versa, the high discharge current design limits the lithium The capacity of the battery. For example, the capacity of a high-capacity 18650 battery is as high as or even more than 5000mAh, but the maximum safe continuous discharge rate of this type of battery is usually in the range of 3-10 amperes. On the other hand, 18650 lithium batteries can safely continue to supply 20-30 amperes of current for 1-5 seconds and up to 40-50 amperes of current. The capacity of such batteries is usually in the range of 2500-3000mAh. Note: When promoting batteries, some manufacturers tend to overestimate the characteristics of their batteries. Therefore, it is very important to read the comments and suggestions of other users, not just the specifications and features supplied by the manufacturer. Or choose a reputable brand, maybe you have to pay more. Welding lugs or not-if there is a problem with the 18650 battery pack, please replace all batteries with new batteries (such as old batteries) that are within the same range (or better) of capacity and charge/discharge current. Always use the same battery manufactured by the same manufacturer, it is best to use the same batch of batteries, and if you have to solder its lugs, please ask a professional to do it for you, because this can be very tricky. Because lithium batteries are sensitive to charging and discharging conditions, temperature, and other parameters, some 18650 lithium battery models have built-in protection electronics that can monitor battery parameters and protect the battery by sealing the battery until the condition changes. Protective electronic equipment requires a certain amount of space, so it will slightly reduce the capacity of the 18650 lithium battery, unless your device already has some kind of battery monitoring function. 18650 lithium battery charger The modern 18650 lithium battery charger is a smart battery charger that can sense battery type, chemical substance, status, etc. These battery chargers can generally be used to charge various batteries, including NiCd, NiMH and various lithium rechargeable batteries. The most important functions of the smart battery charger include:-number of slots (number of rechargeable batteries),-charging current and mode, including battery detection, maintenance mode, full discharge, trick current charging, etc.;-acceptable battery size and chemistry When choosing a battery charger based on other criteria, please choose a battery charger based on current and future needs. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the procedures for customizing 18650 lithium battery packs