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Bench Test Results: Sinowatt 25SP - 20A 2500mAh 18650…costs less, decent performance

Discussion in 'Batteries and Chargers' started by Mooch, Mar 3, 2022.

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  1. Mooch

    Mooch Electron Wrangler ECF Veteran Verified Member

    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.

    05E6BD0D-014A-458A-8F2F-03904A443C38.jpeg 87D18E96-2BC9-4DAB-96D1-1869A9FA33DA.jpeg 2D376D49-9107-4F08-B074-6C2BE44F19CC.jpeg 73AFC49F-1C3E-4B18-BD66-4FF4DA93BA32.jpeg

    Test Results
    This is a decent performing cell that should be available at a lower price. This could make it a good choice for applications where a more expensive high performance cell isn’t needed.

    It is almost equal to the Samsung 25R8 at 10A but doesn’t perform quite as well at 20A. While the datasheet’s 20A continuous discharge rating seems reasonable the 25A ”max instantaneous discharge” rating results in more voltage sag and you must not let the cell get hot. I recommend staying under 20A to reduce voltage sag and increase cell life.

    The two cells I tested delivered 2606mAh and 2634mAh. This is typical consistency for a China-manufactured cell.

    Two cells were purchased for testing by me from Liion Wholesale (Liion Wholesale Batteries | Li-ion battery/cell distributor).

    Continuous Current Discharge Graphs
    4221BACE-AE46-4C9A-9783-7B19226C6DA1.jpeg 53FCF252-9607-4D40-AB77-CA8C748610DD.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
    • Informative Informative x 5
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