Trustfire 26650 li-ion rechargeable batteries

I ordered some Trustfire 26650 batteries from DX, TrustFire 26650 Li-ion Batteries Rechargeable 3.7V "5000mAh" (Pair) - Free Shipping - DealExtreme
The price was $17.20 per pair.

They arrived at me yesterday and I did a test on them. These are protected cells and the top has extra large vent holes. I never seen it before. I only know the King Kong version and the Trustfires don't like it.

The batteries are put against the IMAX B6 charger. First I discharge it right out of the package. The remaining capacity is +/- 3000mAh. Not bad.

I charge the 26650 to the maximum with my DC linear PSU. Very handy for charging big batteries
Then I use the discharge mode with 1A discharge. The IMAX stops at 4016mAh. I set the discharged rate at 0.1A and with a further discharge I manage to squeeze another 280mAh out.
I don't know if this a a right sequenced but otherwise discharging it from full cell with 0.1A takes a very long time. And I am little impatient. :shhh:
A total of 4296mAh capacity. Not the same as the rated 5000mAh but in line with the other brand 4000mAh 26650 cells.

I also measured the internal resistance with a 3Ω resistor. Cell 1 has 119mΩ and cell 2 has 112mΩ.

I believe they are new cells and not fakes. The Trustfire 26650 looks legit to me. Thanks for reading this testing. :thanks:

Blord said:

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Looks like your resistor is dead. You should charge it soon to prevent damage :undecided:

How do you see that ? I measured the 3 Ohm resistor and it is still functioning. Directly on the DMM it measures 3.7 Ohm but the resistor must be in a circuit to get an accurate measurement.

Nice work Kot- and as always great pics-

Recent events have greatly changed how lithium batteries are shipped..

Both the US postal service and DHL no no longer are willing to ship lithium batteries.

The new Jumbo Jets are grounded-

the reason--

lithium batteries- I can no longer ship mine to my CONUS buyers any way except FeD Ex-- and that has come with a much bigger price tag- I just returned from the Fed Ex store and it cost me $11.93 to send six 18650s and four 26650 king kongs from Texas to florida= and that WAS GROUND-- $1.50 of that was the Fed Ex 'box' so I can work around that a little and I can get 10% discount from now on by printting my own ship lables at home but this is still a big jump in shipping costs which I will and must pass on the the buyers- sorry-- I am no longer will ing to take the risk of lying at the PO about the contents of my boxes- would you??

I have a new thread on the batteries I have in stock in the BS&T board-
If its a better deal you are after-- all I can say is to place a bigger order as shipping a few is about the same as shipping many..mine should arrive to the buyers in about three days and ATM thats the best I can do...

sorry, Kot, for the thread jack- glad to see any testing done on the 26650 kingkongs- I have 60 of them in stock..
len




I would also be leery of buying lithium batts from Ebay china- its not that hard to 'see' inside a package with X ray-- and IF a box gets siezed what happens then??
And it could be more seroius than just seizure-

Blord said:

How do you see that ?

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It's putting out zero volts, therefore it's dead. 'twas a joke.

The protection circuit seems to have tripped due to overdischarge.

You should be able to revive it by initiating a recharge and zap it back to life.

Don't leave it discharged for too long, it'll damage the cell.

ryansoh3 said:

The protection circuit seems to have tripped due to overdischarge.

You should be able to revive it by initiating a recharge and zap it back to life.

Don't leave it discharged for too long, it'll damage the cell.

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No, the batteries aren't dead. Cyp made a joke.
The DMM should give 0 Volt because the cells weren't connected in the picture.

If the protection pcb has kicked in and the batteries won't come back alive you can always cut out the pcb. The batteries will become unprotected and you have to be more careful with it.

Hey blord!

What is the max current these cells can discharge? 1A 2A 3A+ ?

thanks for testing :beer:

EDIT n.v.m did my own search and it seems the protection kicks in at 6A!

greetings,,

Blord said:

No, the batteries aren't dead. Cyp made a joke.
The DMM should give 0 Volt because the cells weren't connected in the picture.

If the protection pcb has kicked in and the batteries won't come back alive you can always cut out the pcb. The batteries will become unprotected and you have to be more careful with it.

Click to expand...

Oh, sorry, thought you had a problem with these cells. :crackup:

Just got these batteries in aswell they came in a nice antistatic sealed bag with the genuine trustfire charger I am going to use these for my sinner MSSW build

offroadfreak8582 said:

EDIT n.v.m did my own search and it seems the protection kicks in at 6A!

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6A? That's in? :crackup:

I will say, though, that it is very nice that they live up to the 4000mAh rating. Obviously 5000mAh was just made up ;-)

BShanahan14rulz said:

6A? That's in? :crackup:

I will say, though, that it is very nice that they live up to the 4000mAh rating. Obviously 5000mAh was just made up ;-)

Click to expand...

That the protection kicks in at that current doesn't mean they can deliver 6A Also i think 4200mAh is very good considering most cells from china don't even get to half of there printed labels. These seem to be genuine.

greetings,

BShanahan14rulz said:

6A? That's in? :crackup:

I will say, though, that it is very nice that they live up to the 4000mAh rating. Obviously 5000mAh was just made up ;-)

Click to expand...

6A is good enough for our hobby. If you need more then Li-Po cells are better suited.
They don't hold 5000mAh. The capacity is typical for a 4000mAh 26650 cell.

Oh, I'm not knocking them. Trustfire seems to make decent stuff, just hard to know if you're getting Trustfire or some knockoff trustfire. These cells, the only benefit is that the 4000mAh capacity should stay up there for longer than some other high capacity cells, which can lose capacity if you charge them all the way all the time.

Various places sell the INR26650 bare cell if you need to get another few amps out of it. More than 7 or 8 amps and capacity starts dropping off pretty quickly, though. ICR26650 probably shouldn't be pushed that high. Dunno what TF uses.

Also, am I the only one who is a bit annoyed with all the places calling these "king kong"?

Nice test and review. Thanks!

The Trustfire 26650s look very good --excellent price too