I first came across wholesale sources of 18650s while looking into D-I-Y solar power systems a year ago, but only recently have I tinkered with recovering 18650s from commercial battery pack and renovating them for use in my flashlights, headlamps and other devices. Branded 18650s usually cost around $10, although the higher mAh and high-discharge batteries can cost up to $20 each. Most of these batteries are made by companies like Samsung, LG, Sony, and Panasonic and given a private label treatment by flashlight makers and other companies. Until now, I had been buying commercial 18650s from well-known brands like Tenergy and prominent flashlight makers. You just have to use the right quantity of cells to fit your application. By combing batteries together serially and in parallel, you can devise battery banks that are 12, 18, 24 and 48 volts and provide kilowatts of power. It has a nominal voltage of 3.7 volts and usually offers between 2,600 and 3,400 milliamp hours (mAh). The 18650 cells powering electric scooters, skateboards, laptops, power tools, and probably millions of other rechargeable devices. The 18650 is the most popular Li-ion battery in the portable electronics world and was used to power some of the earlier electric cars. When I buy portable electronics and lights, I go out of my way to buy those that use the 18650 battery. If you are a frequent reader, you know that I like the 18650 rechargeable lithium ion battery. A modem pack in various stages of disassembly to recover the 18650 batteries inside.
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