Test/review of Xtar PB2 Charger & power bank

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HKJ
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ZoomieFan wrote:
HKJ wrote:
Number of cells do not really affect efficiency, but each cell may deliver slightly more energy due to less voltage sag.

For me that’s the main measurement of efficiency.

It is not called efficiency and you can find data for that in my battery test.

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

ZoomieFan
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HKJ wrote:
ZoomieFan wrote:
HKJ wrote:
Number of cells do not really affect efficiency, but each cell may deliver slightly more energy due to less voltage sag.

For me that’s the main measurement of efficiency.

It is not called efficiency and you can find data for that in my battery test.

Then I simply don’t understand it.
If the battery outputs 3500 mAh and the power bank’s electronics only outputs 3000 mAh, I can the difference (lack of) efficiency, because 500 mAh was turned into useless heat.
I don’t see how a batterytest is relevant to this.

Anyway, thanks for the test, I ordered the Xtar.

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88 4/5, LiitoKala: 3x100 3/5, 2x202 3/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k 2/5, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5, Xtar PB2S 5/5
Waiting for: (DQG Tiny) 21700 EDCs.

HKJ
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ZoomieFan wrote:
Then I simply don’t understand it. If the battery outputs 3500 mAh and the power bank’s electronics only outputs 3000 mAh, I can the difference (lack of) efficiency, because 500 mAh was turned into useless heat. I don’t see how a batterytest is relevant to this.

Lower current draw from a battery will get more energy from the battery, that has nothing to do with the boost converter in the power bank, but depends on the battery chemistry.
Boosting the resulting battery voltage to 5V is the job of the boost converter and there the efficiency is interesting.

Both parameters will affect the final amount of energy you can get from the power bank.

When looking at efficiency and you have different voltage, you need to do the calculations in watt or Wh, not mA or mAh.

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

ZoomieFan
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Sure I understand what the cell delivers can, and does, also suffer from inefficiencies. Really I’m not questioning that at all.

Perhaps I should have made myself more clear. The 3500 mAh I mentioned was net power coming from the cell. That’s ++after++ all the losses in the battery.

So what I’m after is only the losses of the Xtar electronics.
Afteral it’s not fair to blame very bad performance of a cell on the Xstar.
Just like it’s not fair to blame losses due to a bad quality 10ft long cable between charger and phone.
Those are all different products and while they for sure have a combined efficiency, you can’t blame Xstar for that.

Peace!

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88 4/5, LiitoKala: 3x100 3/5, 2x202 3/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k 2/5, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5, Xtar PB2S 5/5
Waiting for: (DQG Tiny) 21700 EDCs.

MascaratumB
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I used the XTAR PB2 in the last 2 days to charge my smartphone .

I put 2 Sony VTC6 (+/- 3000mAh) on it and I managed to make 2 charges, even if they were not full: initial “load”, as shown in the PB2, was 88%, batteries were about 4.13V each.

Today I used it and it went back to 0% load, batteries were at 3.08V.

Later today: I put the batteries charging in the PB2. They were at 3.08V on the beginning. About 5 hours later, more or less, they were fully charged up to 4.20V (confirmed on the Opus BT-C3100).
Don’t know if this is important or not, but it is some “data”! :ARROW-RIGHT:

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bmengineer
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XTAR is teasing it's new PB2S on Instragram and it looks pretty promising. From the video:

  • QC3.0 in/out (9V 2A max)
  • USB-A out, USB-C in (probably not to spec)
  • 18650 up to 21700 cells supported
  • In/out current and voltage display

Nice to seee addition of USB-C and support for longer cells - if that USB-C actually works to charge modern devices with a C-C cable, I'll pick one of these up so fast. If it doesn't... Meh. Still some nice upgrades from the original.

Find all my reviews of flashlights and more gear at www.bmengineer.com

Jensen
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Anyone else having problems with their PB2 not outputting more than about 1A? It takes hours to charge my phone with it because of this and it’s not worth using when it’s that slow.

Grappler
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I’m not completely sure, but it’s possible your phone is controlling the charge rate and not allowing a full 2A charge.

 

 

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