Test/review of Thrunite C2 power bank and charger

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HKJ
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Test/review of Thrunite C2 power bank and charger

Thrunite C2 power bank and charger
DSC_7293
A single LiIon cell power bank and charger with fairly high power.
Official specifications:


  • Input: DC 5V, Max 2.4A
  • Output: DC 5V, Max 3A
  • Material: AL T6061 aircraft aluminum body
  • Applicable Battery: ThruNite 3400mAh 18650 rechargeable Li-ion battery
  • Working Temperature: -20?-40?.
  • Size: 92.8mm(Length)*25mm(Width)
  • Weight: only 38g (excluding the battery)
  • Accessories: 1 * USB cable, 1 * 18650 3400mAh battery, 1 * mesh bag

How does it look
DSC_7289
The power bank is delivered in a brown cardboard box.
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It contains the power bank, a usb cable, a bag, a thank you note and a instruction sheet.
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In the power bank was a Trunite 3400mAh battery.
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The bag.
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All connectors and one indicator is placed at one end

  • Micro usb: Charge input.
  • Usb output.
  • Button to turn output on
  • Beneath the plastic is some colored leds (Blue+red). They are used to show charge state.

DSC_7295 DSC_7297
The tail unscrew making it possible to replace the battery or just use it for a 18650 charger.
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It has springs at both ends.
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Measurements


  • Current drain from battery when off is between 15 and 20uA.
  • It will charge the battery to about 4.20V
  • Usb output will turn off at around 3V on the battery.
  • Can be used as ups
  • Usb output is coded as Apple 2.1A
  • Usb output will turn off when current drop below 185mA, but to keep output on the initial current must be above 500mA.
  • Size: length: 93mm diameter: 25mm
  • Weight: 39g (Battery + accessories not included)

Most testing is done with a unprotected Sanyo 18650GA cell.
Thrunite%20C2%20load%20sweep
It may be rated for a maximum output of 3A, but it do not have an overload protection (A protected battery would add that) and the voltage is starting to drop before 3A.
Thrunite%20C2%20charge%20load%20sweep
With charge current connected it looks like the output current is taken from the input.
Thrunite%20C2%20usb%20out%2010%20ohm%20%28SA18650-33%29
The current version has a problem keeping the output on at low current, i.e. I could not do the 10 ohm trace.
Thrunite%20C2%20usb%20out%205%20ohm%20%28SA18650-33%29
At 1A there is no problem and it can run for about two hours.
Thrunite%20C2%20usb%20out%205%20ohm%20%28Thrunite%29
The Thrunite cell has slightly less capacity.
Thrunite%20C2%20usb%20out%202%20ohm%20%28SA18650-33%29
At 2.5A it has trouble keeping the voltage high, when the battery voltage drops.
Thrunite%20C2%20usb%20out%202%20ohm%20%28Thrunite%29
Using the protected Thrunite battery is even worse.
10ohm
The noise is low at 0.5A load with 13mV rms and 100mVpp.
5ohm
The noise stays low at 1A with 15mV rms and 115mVpp
2ohm
At 2.5A the noise is also low with 17mV rms and 117mVpp.
Thrunite%20C2%20charge%20%28SA18650-33%29
The charge current is a bit high at 2.2A, but it makes it fairly fast to charge the power bank. The high termination current do also help making it fast, but means the battery will lack a few percent in being full.
Thrunite%20C2%20charge%200.5ohm%20%28SA18650-33%29
Adding a resistor in series with the 5V power supply to simulate a long cable or weak supply, will slow down the charge.
Conclusion
The power bank turns off at way to high load, making it difficult to use for many things, as a charger the current is on the high side (Using a 18650 that is rated for high charge current would fix that). I am not impressed with the rated 3A output, I would have prefered a 2.5A with overload protection.
The construction is nice with a aluminium tube and easy replaceable cell.
For now I cannot really recommend it, making it better at staying on would fix some of it.
Notes
The power bank was supplied by Thrunite for a review.
Read more about how I test USB power supplies and chargers

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

CRX
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Saved me some cash and disappointment, thanks. I had higher hopes for this powerbank, but not as high as that cut off Wink

A_M_K
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Hey HKJ,

Great review! If I heard this right, Thrunite put the production on hold until they fix the current issues. Will you review the updated/fixed version that will come in January???

I also want to ask, is it possible to unscrew the front end where the PCB board is? Also, does the unit get very hot after 15-20 minutes of high load or charging?

Overall, it does seems to have problems at the moment, but it’s quite an ambitious attempt at creating a really powerful and practical single cell power bank, so kudos to Thrunite for that.

I’m really looking forward to the release of the fixed version.

Cheers

HKJ
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A_M_K wrote:
Will you review the updated/fixed version that will come in January???

I do not know that yet.

A_M_K wrote:
I also want to ask, is it possible to unscrew the front end where the PCB board is?

It do not unscrew or otherwise remove easily.

A_M_K wrote:
Also, does the unit get very hot after 15-20 minutes of high load or charging?

Yes, but my IR camera do not work with it (I would need to put black tape on it).

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

will34
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Thanks for the review, I kind of expected the 3A discharge too good to be true, hope they fix this and the high auto shut off in the new version.

atbglenn
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I have one and I have to say it’s completely useless for my needs. I’ve been in contact with Thrunite and they tell me they will replace mine once they fix the problem. Hopefully they keep their word.

I tried known good fully charged unprotected Samsung cell and got the same results without the USB charge detector

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mckeand13
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I just received an email stating that they are pre-ordering again after being “sold out”.

I’m interested in a review of the latest release to see if their issues have been resolved. Just wondering if anybody is working on one? Maybe Thrunite provided a sample again?

HKJ
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mckeand13 wrote:
I’m interested in a review of the latest release to see if their issues have been resolved. Just wondering if anybody is working on one? Maybe Thrunite provided a sample again?

They asked me if they could send an update version for review after I published the review. I have not received anything yet, but maybe I will.

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

Ozythemandias
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The new revision is on preorder currently. They didn’t update the description, still says it won’t work with low drain devices.

Edited for typo

 

mckeand13
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I emailed Thrunite and asked if the they have updated the powerbank based on the comments from reviews. Here’s the reply I got from David:

“It is same as before.just not support low current instruments”

That doesn’t help much.

finges
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mckeand13 wrote:
I emailed Thrunite and asked if the they have updated the powerbank based on the comments from reviews. Here’s the reply I got from David:

“It is same as before.just not support low current instruments”

That doesn’t help much.


I think (hope) that is a typo and should mean “now” instead of “not”.
zak.wilson
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This is the reply I got:

Quote:
We do not any change for it

which I read as no changes.

That’s quite unfortunate, as in all other respects it was the powerbank I’ve been wanting for years.

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atbglenn
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zak.wilson wrote:
This is the reply I got:
Quote:
We do not any change for it

which I read as no changes.

That’s quite unfortunate, as in all other respects it was the powerbank I’ve been wanting for years.

Thrunite told me I was getting an updated version in about 15 days. We’ll see what happens.

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finges
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atbglenn wrote:
zak.wilson wrote:
This is the reply I got:
Quote:
We do not any change for it

which I read as no changes.

That’s quite unfortunate, as in all other respects it was the powerbank I’ve been wanting for years.

Thrunite told me I was getting an updated version in about 15 days. We’ll see what happens.

Yes, I will also get an updated one after Chinese new year Spring Festival. I hope they fixed it!

hank
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So this is no longer for sale on Thrunite’s website. Did they just give up trying to solve its problems?
Is there any way to know which version is being sold by third parties?