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Bench Test Results: BAK N21700CG-50 – 15A 5000mAh 21700…decent performer, equal to Samsung 50E3

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Electron Wrangler
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  • May 13, 2015
      These tests below only note my personal ESTIMATED ratings for the batteries I tested at the time I tested them. Any battery that is not a genuine Samsung, Sony, Murata, LG, Panasonic, Molicel, or Sanyo can change at any time! This is one of the hazards of using “rewrapped” or batteries from other manufacturers so carefully research any battery you are considering using before purchasing.

      Misusing or mishandling lithium-ion batteries can pose a SERIOUS RISK of property damage, personal injury, or even death. They are not supposed to be used outside of a fully protected battery pack and you use them at your own risk. Never exceed the battery’s true continuous current rating and keep the plastic wrap and top insulating ring in perfect condition.

      Testing batteries at their limits is dangerous and should never be attempted by anyone who has not thoroughly studied the dangers involved, understands the risks, has the proper equipment, and takes all appropriate safety precautions.

      If the battery has only one current rating number, or if it only says "max", then I have to assume the battery is rated at that current level for any type of discharge, including continuous.

      241C88C3-7F61-46EF-BE43-32F5DAB355A6.jpeg 8C30FE0B-06EA-4756-9C64-695AB70E8F38.jpeg 83DD1C54-89F3-4DC9-A017-2CC85ACBD6CC.jpeg 37E9C117-16F2-4DB9-A2D1-B33502E615C9.jpeg

      Test Results
      BAK is one of the large, established manufacturers in China and this cell performs well. This is important since cells from the major manufacturers are harder to find and are sometimes old stock, low grade, or even fake. Good performing alternatives like these are great to see.

      This BAK performs a little better than the Molicel M50A (but the BAK runs a few degrees hotter) and about the same as the Samsung 50E3. It doesn’t perform as well as the Samsung 50S but that cell is very expensive and hard to find.

      The datasheet rates this cell at 15A but notes that this affects cycle life. I recommend staying below 10A to reduce risk, increase overall cell life, and increase performance.

      The two cells I tested delivered 4987mAh and 5020mAh. This is decent consistency for a cell from one of the large, established China factories. Both cells tested above their 4900mAh minimum capacity rating and essentially at their 5000mAh typical rating.

      Two cells were donated for testing by 18650BatteryStore (18650 Battery Store - Lithium Ion Batteries, Chargers and Accessories). Thank you!

      Continuous Current Discharge Graphs
      2300534B-9FBE-4480-B37A-099A93711C2A.jpeg FEB76F40-6D09-4FC0-B9D1-2178CAA757E9.jpeg BDE0FC08-21D5-493A-806E-E4D95E86357B.jpeg

      Ratings and Performance Specs Graphic

      I want to work for the community full time! If you feel what I do is worth a couple dollars a month and you would like early access to battery availability, battery and charger testing and news, and a say in what I test, then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery and device tests | Patreon.

      To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
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