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Bench Retest Results: Molicel P28A 2800mAh 18650..equal to P26A, tied for best all-around 18650

Discussion in 'Batteries and Chargers' started by Mooch, Apr 26, 2019.

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  1. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    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 protected battery pack. Never exceed the battery’s current rating and keep the plastic wrap and top insulating ring in perfect condition.

    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.

    BF135E87-C633-4989-85FF-5604BF0A32E3.jpeg 5578B68F-ACE7-490C-9D50-9962CBD973C7.jpeg EDBEE12B-ED95-4D1A-AB9C-2A9F8A24C293.jpeg 69F1E2BF-D648-43AC-920D-C54435B3C676.jpeg

    Bottom Line
    This is a great performing cell. Down to about 3.2V it is essentially equal to the Molicel P26A, performing just a bit below it at very high current levels. Only below 3.2V do you see the P28A running for longer due to its higher capacity.

    While the Sony VTC5A and Samsung 25S hit a little harder at the start the P28A catches up soon and runs for the same amount of time or perhaps a bit longer than the VTC5A. The P28A is almost equal to the Samsung 25S at 20A and 30A (30A is above their ratings and this test was only to compare performance).

    If you use a mech and you change cells VERY early then the VTC5A might be the better choice because it hits a little harder at the start. But if you run your cells down to 3.5V-3.6V (when put on the charger), and wanted a slightly more consistent vape that could run for longer, then the P28A is worth trying.

    The Samsung 20S is still the best choice when above 25A though as it holds its voltage up better at 30A.

    The datasheet for the P28A lists 35A as the “maximum discharging current” rating. But running this cell continuously at 35A gets it much too hot, about 99°C, for that to be a true continuous current rating we can use for comparing to other cells. I consider Molicel’s rating to be temperature-limited so you must stop before the cell gets hot. There’s no maximum surface temperature rating in the datasheet so stop before the cell reaches 60°C. This is roughly the temperature where it becomes too hot to hold in a tightly closed fist. For any battery it’s best to never let them get more than warm though because heat accelerates their aging.

    The datasheet lists the minimum capacity at 2700mAh and typical capacity at 2800mAh. The four P28A’s I tested delivered 2745mAh-2787mAh at 560mA (0.2C) down to 2.5V. This is good consistency and they all met their minimum capacity rating.

    I am rating this Molicel at 25A continuous with a temperature-limited rating of 35A as long as you stop before the cell reaches 60°C.

    The rated dimensions are 18.6mm max diameter by 65.2mm long. The largest dimensions I measured were 18.4mm diameter and 64.9mm length.

    The P26A and P28A are tied for my choice for best all-around 18650, for up to 25A or 75W per cell. The combination of their great performance along with their availability from authorized Molicel vendors makes them the best 18650 choice in my opinion for moderate to high power use in any device. We don’t have to worry about getting low grade, counterfeit, or old cells and Molicel is willing to sell to the vaping community. No other battery OEM is openly willing to do that.

    Four cells were donated for the purposes of testing by Moli (Molicel-E-One Moli Energy Corp-Company Profile) and N-Power Energy, Ltd. (Home – N-Power Energy Limited ). Thank you!

    Continuous Current Discharge Graphs
    4F331319-5C4B-4CB0-91B8-1A01FBD5BB49.jpeg 04566F4D-76CE-4319-B075-F3599E194444.jpeg

    Ratings Graphic

    Performance Specs
    - DC Internal Resistance = 18.8mOhms (milliohms) average for six cells.
    - Total energy delivered down to 3.2V at 10A continuous = 7.6Wh
    - Total energy delivered down to 3.2V at 20A continuous = 5.8Wh

    I want to work for the vaping 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 and testing news and a say in what I test then please consider becoming a patron and supporting my testing efforts: Battery Mooch is creating battery tests and educating vapers | Patreon.

    To see how other cells have tested check out this link: List of Battery Tests | E-Cigarette Forum
    • Informative Informative x 6
    • Like Like x 3
  2. Thanks for the test. For my modded torch I do not think it would matter if I used these or my P26A Cells.I never take them below 3.50V[Resting voltage]. Although, I have NO idea[maybe ~ 3.2v] what the voltage is when I turn the light off. The 3.50v is 10 minutes later when I get home,,,with obvious time to rebound.

    Like you said, "Down to about 3.2V it is essentially equal to the Molicel P26A".

    Either cell is win win.

    My Hometown dealer put them on sale today!

    Molicel/NPE INR-18650-P28A 35A 2800mAh Flat Top 18650 Battery - Authorized Distributor
    • Like Like x 2
  3. Strtsmthng

    Strtsmthng Full Member

    Aug 15, 2018
    ...and now NKON has them in stock, too - and for a better price than VTC5D :)
  4. Evi|grin

    Evi|grin Ultra Member Verified Member ECF Veteran

    Aug 21, 2013
    Ive been using VTC6s and 30Qs which are now around a year old. Nothing ever over 40watts but i still want to try these batteries. I got a Series B which cuts off lower than my SX Mini...Yes i realize i can change the cut off but i would like to try a higher amp rated battery just to be on the "safer" side.
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