Bench Test Results: Xtar 30A/45A 4200mAh 21700...almost accurately rated, appears to be Molicel P42A

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  • May 13, 2015
      These tests below only note the ESTIMATED ratings for these batteries 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 personal injury or property damage. They are not meant to be used outside of a physically and electrically protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition. Use of any of these batteries is AT YOUR OWN RISK.

      Testing batteries at their limits is dangerous and should never, ever, 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.

      9D20B76B-6CEC-4A5C-88E1-AF1793F3F460.jpeg F27D4B60-21D3-44D0-8C91-5F589CA59559.jpeg F34A6436-C4C1-45F4-9039-1FC5A0CBC564.jpeg 801C3456-CE36-4D77-A5E5-9EBC5350F075.jpeg

      Bottom Line
      This cells looks and performs identically to the great performing Molicel P42A.

      Xtar rates this cell at 30A continuous and 45A “max pulse discharge”. While both ratings are spelled out on the wrap in tiny text a different larger “45A” is much more clearly seen on another part of the wrap. I prefer to just see the continuous current rating shown this way to allow for direct comparison between cells.

      The Molicel datasheet for the P42A only lists a 45A “maximum discharging current” rating with a max temperature cutoff of 85°C. This means you can use the P42A at up to 45A as long as the cell stays below 85°C. This should be easy to do as 85°C is frakkin’ hot. Just realize that this cell in an autofiring device, or a mech that accidentally has its button being pressed, could easily exceed this temperature by a LOT if you are set up to vape at 45A.

      I am giving this cell a 30A continuous current rating since that is as high as you can go while not exceeding the 85°C cutoff. This matches Xtar’s 30A continuous rating. To extend cell life, minimize voltage sag, and increase your safety margin, I recommend staying at 25A or under per cell. That’s about 75W.

      The two cells I tested delivered 4073mAh and 4145mAh. This is not very good consistency. While it meets Molicel’s 4000mAh minimum capacity rating for the P42A it does not meet Xtar’s 4200mAh rating. I am rating these Xtar’s at 4000mAh.

      Two cells were donated for the purposes of testing by Xtar (XTAR,the best choice for fast charing). Thank you!

      Discharge Graphs

      Ratings Graphic

      Performance Specs
      DC Internal Resistance = 17.5mOhms (milliohms) average for the two cells.
      Total energy delivered down to 3.2V at 10A continuous = 12.1Wh
      Total energy delivered down to 3.2V at 20A continuous = 10.4Wh
      Total energy delivered down to 3.2V at 30A continuous = 8.5Wh

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