Test/Review of Efest IMR26650 3500mAh (Purple) 2014

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HKJ
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Test/Review of Efest IMR26650 3500mAh (Purple) 2014
Efest IMR26650 3500mAh (Purple) 2014

DSC_6765

Official specifications:
  • Typical capacity: 3500,Ah
  • Maximum discharge current: 32A
  • Maximum pulse discharge current: 64A
  • Maximum charge current: 6.5A
  • Resistance: 13mOhm +/-2mOhm
  • Nominal voltage: 3.8 volt
  • Discharge cut-off voltage: 2.5 volt
  • Full charge voltage: 4.2 volt
  • Temperature range: -20°C ~ 60°C
  • Temperature range discharge: -20°C ~ 60°C
  • Temperature range charge: 0°C ~ 45°C
  • Monthly self-discharge rage:
    Efest%20IMR26650%203500mAh%20(Purple)%202014-info

    A high current 26650 batteries, this time Efest has printed both the pulse and the continuous rating on the battery.

    DSC_6764

    DSC_6766 DSC_6767

    DSC_6768
    DSC_6769

    Efest%20IMR26650%203500mAh%20(Purple)%202014-Capacity

    The discharge curves is tracking nicely and capacity is nearly constant up to 20A and do also match the marked capacity. The 30A curve is a bit high for the battery.

    Efest%20IMR26650%203500mAh%20(Purple)%202014-CapacityTimeHours

    Efest%20IMR26650%203500mAh%20(Purple)%202014-CapacityTime

    Efest%20IMR26650%203500mAh%20(Purple)%202014-Energy

    Efest%20IMR26650%203500mAh%20(Purple)%202014-PowerLoadTime

    Efest%20IMR26650%203500mAh%20(Purple)%202014-TripCurrent

    Efest%20IMR26650%203500mAh%20(Purple)%202014-Charge



    Conclusion

    It looks like this battery follows the Efest style for the purple batteries with very good high current performance. The price for this high current performance is less capacity.



    Notes and links

    The batteries was supplied by Efest for review.

    How is the test done and how to read the charts
    How is a protected LiIon battery constructed
    More about button top and flat top batteries
    Compare to 18650 and other batteries

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Werner
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That is indeed a high current cell which deserves its name. Thanks for the review.

dangerous
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Wow, the high voltage at high drain is amazing on this cell – it blows everything else away. Shocked

BLF

Fritz t. Cat
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Thanks.

Flashlight designers should look at lighthouses and pottery.
这些谁设计的手电筒应该看灯塔,以及在陶器。

WarHawk-AVG
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Awesome review…man it sure did hold tough at those high current drain levels

Thanks!!!

Tom E
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Again, awesome! I've only got these recently and have been very impressed. For my DD light mods, they did as well as the Efest 35A, Sam 25R, LG HE2, SONY VTC5, so thought it would show well in your tests. Though the capacity is low by today's standards for 26650's, it's the SONY 26650 equal (or better) and much higher capacity.

Calmaja
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Thanks HKJ.

Lothar
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Thank you for the awesome review (as always) HKJ.

I'm really surprised to see how much better these hold their volts with high amps, relative to the Keeppower IMR26650 3500mah's. Could these be different cells than the Keeppowers?

Current Collection:

BLF: BLF-GT90, BLF-GT70 (CW Sliced), BLF GTmini, BLF-LT1; 

BTU: Shocker (3 x SST-40 @ 8A)

Solarforce: L2P (XM-L2 U3 @ 4A), MPP-1 (XP-L HI @ 6A), MPP-3 (3 x XM-L2 U2 @ 12A), M6 (Nichia 319A @ 6A), M8 (XHP-50.2 @ 9A), 9x (9 x XM-L2 U2 @ 2A)

Coming Soon: Lumintop: BLF-GT4; 

Dru_dragon
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Wow these look like the new high discharge king! Will you be testing the green Efest 4200mahs also?

Andrew

HKJ
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Lothar wrote:

I'm really surprised to see how much better these hold their volts with high amps, relative to the Keeppower IMR26650 3500mah's. Could these be different cells than the Keeppowers?

Comparing the 20A curve I believe they are different cells.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

HKJ
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Dru_dragon wrote:
Will you be testing the green Efest 4200mahs also?

I have no plans for that at the current time, but maybe Efest will send some batteries to me (They do that sometimes).

I do still have a few Efest batteries in queue from the last batch I received. At that time I had a very long queue:

I have tested most of it now.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/