2 Bay Charger With Power Bank?

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Brawler1588
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2 Bay Charger With Power Bank?

I am looking for a 2 bay charger that also doubles as a power bank to use on camping trips are there any out there?

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Xtar PB2

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Brawler1588
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X3 wrote:
Xtar PB2

Does that only work with 18650 and what’s the height limit on the batteries.
bmengineer
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Xtar vc2s, armytek handy c2 pro

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Brawler1588 wrote:
X3 wrote:
Xtar PB2
Does that only work with 18650 and what’s the height limit on the batteries.

It’s pretty picky. Flat top unprotected cells only.

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Virisenox_ wrote:
Brawler1588 wrote:
X3 wrote:
Xtar PB2
Does that only work with 18650 and what’s the height limit on the batteries.

It’s pretty picky. Flat top unprotected cells only.

Plus it will NOT charge small devices like my mP3 player, bluetooth headphones, small flashlights(TINI, TIP)
Not handy or versatile at all.

Brawler1588
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Seems like the vc2 one seems like a good option looking at the other 2 mentioned.

rost333
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I am using it on daily basis and I do recommend it.

d_t_a
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tundraotto wrote:
Liitokala lii-202

Though Lii-202 (and actually, the Lii-100, Lii-402) only use the right-most slot (ie. only 1 battery) for powerbank function.

The 2-slot Lii-300 Engineer can use both slots for powerbank function, although it’s a bigger-sized charger/powerbank..

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chinooker wrote:
Virisenox_ wrote:
Brawler1588 wrote:
X3 wrote:
Xtar PB2
Does that only work with 18650 and what’s the height limit on the batteries.

It’s pretty picky. Flat top unprotected cells only.

Plus it will NOT charge small devices like my mP3 player, bluetooth headphones, small flashlights(TINI, TIP)
Not handy or versatile at all.

I love the PB2 but the inability to charge low drain devices is a bummer. If I had known that before hand I would have never bought it. Oh well, it charges the wifes cell phone when she is out and about for the day and it does charge a few particular 18650’s quickly. Other than that, it’s useless.

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chinooker wrote:
Virisenox_ wrote:
Brawler1588 wrote:
X3 wrote:
Xtar PB2
Does that only work with 18650 and what’s the height limit on the batteries.

It’s pretty picky. Flat top unprotected cells only.

Plus it will NOT charge small devices like my mP3 player, bluetooth headphones, small flashlights(TINI, TIP)
Not handy or versatile at all.

Why?
Thanks, Jerry

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jerm03 wrote:
chinooker wrote:
Plus it will NOT charge small devices like my mP3 player, bluetooth headphones, small flashlights(TINI, TIP) Not handy or versatile at all.

Why?
Thanks, Jerry


PB2 will turn off when output is lower than (I think) around 300mA. So charging the smartphone is fine as it has high current for fast charging, but some devices use low current (for low capacity battery) and it will not work with PB2 as power bank.. Deal breaker for me too, I would have two PB2s already at home if it does not do this..
gpbeiew
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Xtar VP2
1 slot has powerbank function
Fits batteries up to 71.2mm length (according to HKJ’s review).
Fits Samsung 48G 21700

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Rost333, that power bank box you linked says:

Quote:
for Sumsang 180125 … Cell type: 18650 battery
Input: DC 5V/1A (max.)
Output: DC 5V/1A (max.)
Built-in battery capacity: 5600mAh

18650 battery is not included.
The battery must be right installed before you can use.
Installing the battery must pay attention to the positive and negative, anti-loaded will burn, burned out is not returned.

How do they figure 5600 mAh? One cell, or two?

rost333
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hank wrote:
Rost333, that power bank box you linked says:
Quote:
for Sumsang 180125 … Cell type: 18650 battery Input: DC 5V/1A (max.) Output: DC 5V/1A (max.) Built-in battery capacity: 5600mAh … 18650 battery is not included. The battery must be right installed before you can use. Installing the battery must pay attention to the positive and negative, anti-loaded will burn, burned out is not returned.

How do they figure 5600 mAh? One cell, or two?


It has charging indicator built-in

It’s not the best quality but it works just fine for more than a year now Wink

d_t_a
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rost333 wrote:
hank wrote:
Rost333, that power bank box you linked says:
Quote:
for Sumsang 180125 … Cell type: 18650 battery Input: DC 5V/1A (max.) Output: DC 5V/1A (max.) Built-in battery capacity: 5600mAh … 18650 battery is not included. The battery must be right installed before you can use. Installing the battery must pay attention to the positive and negative, anti-loaded will burn, burned out is not returned.

How do they figure 5600 mAh? One cell, or two?


It has charging indicator built-in

It’s not the best quality but it works just fine for more than a year now Wink

Does it feature independent charging? Meaning the 2 batteries are in parallel or separate? (what I mean is, if they are in parallel, then it may not be good to charge 2 different capacity batteries or 2 batteries in different state of charge (different voltage when first placed inside that powerbank)..

The Xtar PB2 has independent charging. I believe many of the Tomo (2/3/4-bay) powerbank/charger models also have independent charging.

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An inherent problem with removable cell power banks is contact resistances (springs, contact themselves and etc). They pose an efficiency and to some extent cut-off hurdle which increases with current draw.

Power bank circuitry works much better when batteries are soldered (low temp solder solutions available) or spot welded.

 

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d_t_a wrote:
Does it feature independent charging? Meaning the 2 batteries are in parallel or separate? (what I mean is, if they are in parallel, then it may not be good to charge 2 different capacity batteries or 2 batteries in different state of charge (different voltage when first placed inside that powerbank)..

The Xtar PB2 has independent charging. I believe many of the Tomo (2/3/4-bay) powerbank/charger models also have independent charging.

Is’t $1,14 powerbank. Can’t expect independent charging.
I just put 2 new batteries in it and it works OK.

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@dta

1. They are in parallel. Therefore, even if they have different capacities, they will behave as a sum of both capacities.

2. No independent charging. That means do not put 2x cells with more than 0,1V of difference when setting it up.

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BlueSwordM wrote:
@dta

1. They are in parallel. Therefore, even if they have different capacities, they will behave as a sum of both capacities.

2. No independent charging. That means do not put 2x cells with more than 0,1V of difference when setting it up.

Thanks for the additional explanation, but I still have some questions…

Assuming 2 batteries (in the above parallel-type powerbank) have different capacities but same voltage, then it’s safe to use in the powerbank, is that what is meant?

But if 2 batteries have a big voltage difference, then that’s a no-go, since (from what I understand), the higher voltage battery is going to “charge” the lower voltage battery at a possibly very fast charge rate. But what happens if this has been done? Will the batteries spark or explode? Or its just going to shorten battery life? Or do some other not-so-good thing (like damaging the powerbank circuitry)?

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d_t_a wrote:

But if 2 batteries have a big voltage difference, then that's a no-go, since (from what I understand), the higher voltage battery is going to "charge" the lower voltage battery at a possibly very fast charge rate. But what happens…

Of course you can avoid that by measuring battery voltage with a multimeter or battery charger. Nothing very wrong can happen anyway since the current flow will be limited by the sum of both cells internal resistances plus contact and spring resistances, and the initial current inrush soon tapers very much like the current tapering which happens upon entering CV phase during a standard charge. If you witness sparks or fumes out of the circuitry upon cell insertion you are either inserting a cell in reverse Facepalm (DO NOT!) or cell voltages are too dissimilar. Better avoided but no big deal. 

 

Smile 

 

 

The human mind, and its programming, is at the forefront of a particular battle of The Light vs evil dark forces. Nearly every human being on this beautiful planet “Earth” has some sort of negative mind programming in its mind. And you better take care of your mind programming, or someone else will in this wicked world.

Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.

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