How do I test a battery for its drain, life, etc.? I'm assuming there is a specific product that gives you all the information on your battery that you could want.
The mAh rating (ie AW IMR 18650 2000mAh) can provide a very rough estimation of the battery time. 100 mAh = 1 hour. 2000 mAh = 20 hours. This is figuring you will be using the battery at a fixed 3.8 volts; higher voltage will decrease the battery time. However, mAh ratings are often dubious at best, especially for lesser quality batteries.
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