Test/review of BestFire IMR18350 1500mAh (Black-silver)

HKJ · 2018-08-24T14:56:46.000Z

BestFire IMR18350 1500mAh (Black-silver)

Official specifications:

Nominal Capacity: 1500mAh
Type: Li-ion rechargeable battery.
Size: 18350
Size: 18*35mm
Voltage: 3.7V
Current: 30A

A 18350 with very high capacity and super high current? Maybe not

The battery is a good battery, but the specifications are 1000mAh and 10A

Conclusion

It is not surprise that the battery do not match specifications, that is seen before from Bestfire.
The battery is a good battery, but with considerable less capacity and current delivery than specified.

Notes and links

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
Comparison to other LiIon batteries

djozz · 2018-08-24T15:06:26.000Z

Thanks for the test!

This is the kind of battery that needs your testing to find out that it falls short of the best batteries of its price class, common customer reviews will not reveal that because it is a pretty good battery.

MRsDNF · 2018-08-24T21:32:37.000Z

Thanks again HKJ.

DavidEF · 2018-08-24T21:44:18.000Z

djozz:

Thanks for the test!

This is the kind of battery that needs your testing to find out that it falls short of the best batteries of its price class, common customer reviews will not reveal that because it is a pretty good battery.

Yeah, djozz is right. It’s good enough, and most people won’t ever use it above its real capability to find it failing on them. Thanks for the testing!

moderator007 · 2018-08-24T21:45:41.000Z

Looks like a decent 18350 but still can’t knock the crown off the king, the Aspire 18350.
Thanks for the testing HKJ :+1: .

Barkuti · 2018-08-25T02:29:29.000Z

Maybe a tad lower binned Yongdeli 18350 1100mAh :-D “15A” (same cell as Aspire 1100mAh and others).

By the way, given the highly fakeful brand name cell sales in AliExpress, maybe we should get a few reviews of that class. If so, Henrik please specifically request to be served fakes as everyone else, it must not be the case the seller identifies you as a reviewer and then proceeds to send you genuine stuff. LoL! :-D

Cheers ^:)

HKJ · 2018-08-25T06:11:00.000Z

Barkuti:

Henrik please specifically request to be served fakes as everyone else, it must not be the case the seller identifies you as a reviewer and then proceeds to send you genuine stuff. LoL!

I doubt very much that a random Aliexpress or Ebay seller knows I am a reviewer when I buy these cells.

Barkuti · 2018-08-25T07:40:00.000Z

Of course that was a joke Henrik. :-D

Anyway, due to a recent dispute I had I ended up with these cells I have no idea where they come from (got ½ my €urobucks back):

Here is the test I made with the known good 25Rs:

It seems there's some cell differences, i.e. they're not as consistent as premium brand ones.

With the help of a friend, multimeter and precision power supply we made some measurements and sort of estimated their internal resistance: 33, 34.4, 36.6 and 37.6mΩ, for an average of 35.4mΩ.

Who could be their OEM?

Cheers ^:)