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Old 11-30-2019, 03:04 PM   #1
sam_sam_sam
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Default This Black-Web battery power supply for tablets and phones with a twist

I have bought quite a few these from Walmart brand Black-Web battery pack quite a few times before (with the four LED light that indicates charge level runs on 4.2 volts ) but this one is a little different ( this one has the percentage of change which runs on 8.4 volts ) in 95% of them run off of 4.2 volts but this one runs off of 8.4 volts

One note I have two of them and I would not recommend taking them apart until you run the battery pack down to 0%

This is going to make a project that I want to do is going to be a lot easier with this power supply board

One note the battery packs that run off of 4.2 volts has a plastic housing
( easy to take apart )

The battery pack that runs off of 8.4 volts has a aluminum ( housing this battery pack is very hard to come out because of the glue that they use to keep the battery in place )

You have to cut the front of aluminum case a long each side in the middle of the rounded sides ( not to deep into the case just enough to cut the metal ) about a 1/4

( this is with two 18650 in series as a guide from the end that does not have the display )

of way down on each side and pry on top of plastic circuit board case until you can see that the glue has released from the case on top and bottom of the batteries

( the end that has the display board )

to release the glue so batteries can come out you MUST take your time doing this step and not be in a hurry or you will have an accident if you are not careful the one nice thing about the way they put this circuit board it is in a plastic case this the only reason I try to get it apart
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Last edited by sam_sam_sam; 11-30-2019 at 03:53 PM..
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Old 12-01-2019, 06:17 PM   #2
sam_sam_sam
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Default Re: This Black-Web battery power supply for tablets and phones with a twist

I took the second battery pack apart and this one was a lot faster to come apart because I learned from the first one how to take it apart
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Old 12-01-2019, 08:02 PM   #3
eccerr0r
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Default Re: This Black-Web battery power supply for tablets and phones with a twist

Sigh.

I might have to get another one of these things. I had one but accidentally fed in 19V into the charging port that requires 5V... Not sure what got damaged but it's totally toast now, though there's no visible damage to the components.

If I get another, I'm not sure if I'd care if it's 4V (1S) or 8V (2S) pack. I don't mind the linear LED fuel gauge, the 7-seg doesn't do much for me.
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Old 12-01-2019, 08:19 PM   #4
sam_sam_sam
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Default Re: This Black-Web battery power supply for tablets and phones with a twist

I am going to check the accuracy of it when I get some heat sink tubing that fit these 26650 batteries but it will not be until the end of week before I get to the battery place that I buy this stuff from

Unless I decide to use some pouch type batteries that I have if I can find a case for them

There is a difference between the 1s verse the 2s version and it is the amount of current it put to the USB output connector to your tablet at least for the IPad the IPhone it does not make any real difference

One thing you might be interested in is that the batteries say that 3350 milliamperes well not exactly but close I tested two of them and got 3029 and 3085 which very good for non brand batteries

This was the pack that I took a picture of that I posted above

One note

You do not have to cut the aluminum case in the center along the side but you do have to use a couple plastic knife and put it in between the battery and case and pry up on the knife to the top and bottom of the case with a small screwdriver carefully and then you can push the batteries out it does take some time to do this so do not be in a hurry

You can see if the glue has released from the case if you shine a light inside the case

Last edited by sam_sam_sam; 12-01-2019 at 08:52 PM..
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Old 12-02-2019, 09:13 PM   #5
eccerr0r
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Default Re: This Black-Web battery power supply for tablets and phones with a twist

Well, the 1S configuration, discharge needs to boost to 5V and (optionally) buck to charge from 5V.

For the 2S configuration, one needs to buck to 5V for discharge, and boost from 5V to 8.4V to charge (if they use 5V charging).

So the 1S should be cheaper if they used an LDO regulator to charge, but not sure if it's that much worse. However as usual, more volts is usually more efficient, so perhaps you get a bit more life out of a 2S configuration for the battery capacity?
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