Bench Test Results: Keeppower UH1835P - 10A 1200mAh 18350


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  • May 13, 2015
    These tests below only note my personal opinion for the 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 can be 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. Never use them outside of a fully protected battery pack and you use them at your own risk. Never exceed the battery’s true continuous discharge rating (CDR), never let it get colder than 0°C or hotter than 60°C, and keep the plastic wrap and top insulating ring in perfect condition. Never use a battery that is physically damaged in any way.

    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.

    IMG_3690.jpeg IMG_3691.jpeg IMG_3692.jpeg IMG_3693.jpeg

    Test Results
    It’s been four years so it’s time for a retest. This Keeppower is a decent performer and no longer uses the very inconsistent Yong De Li New Energy co. (YDL) cell, which was sometimes better performing but only if you got a “good” one. This cell used by Keeppower and some others is better but 18350’s are still more inconsistent than larger cells.

    This Keeppower’s capacity rating is exaggerated. The two cells I tested delivered 1126mAh and 1132mAh. This is below this cell’s 1200mAh rating and since I cannot have the two lowest capacity cells in the batch I am rating them 1100mAh.

    The 10A rating pushes them hard so I recommend, like with all cells, operating it at lower than its rating. For best performance (not lots of voltage sag) and long cell life I recommend staying under 5A-7A (15W-21W). Charge at 0.5A or lower!

    The 15A “Max Pulse” rating will result in HUGE voltage sag and very short run times. If you are pulsing at current levels this high do not allow the cell to get hotter than 60°C to help lower the risk and extend cell life.

    This cell has an extra line of sealant or epoxy at the top, where the rolled over edge of the metal can meets the top plastic sealing ring. I have never seen this on any other cell and I do not know why it is there. Rust prevention (when used in a humid environment) at the edge of the metal can perhaps? I scraped out this sealant/epoxy and did a few cycles of high-current pulse discharging without problems. I do not think the sealant/epoxy line is there to help keep the cell from leaking.

    Continuous Current Discharge Graphs
    Keeppower UH1835P - 10A 1200mAh 18350 CC Tests - June 2023.jpeg

    Ratings and Performance Specs Graphic

    18650 Ratings and E-Scores Table:

    20700/21700 Ratings and E-Scores Table:

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    To see how other cells have tested check out this link: Links To All 21700, 26650, 18350, 18500 Battery Tests

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