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Bort
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dchomak wrote:
Enderman wrote:
?? 4Ah = 4000 mAh

You are right, 4Ah = 4000mAh

Most power banks have 1 or more cells in parallel and their voltage has to be boosted to the 5V output that is required. If there were 5 cells in a power bank, each having a capacity of 2000mAh, they would rate the power bank at the sum total of the capacities of all the cells, 10,000 mAh.
Power banks aren’t usually made this way, but if they used those same 5 cells in series and bucked the voltage down to 5V, they would still call it a 10,000 mAh power bank.
18V Ridgid, Milwaukee, Ryobi, etc power tool batteries use 5 cells in series, 21V fully charged. So a 4Ah, 18V battery would have 10 2000mAh cells in a 5S2P configuration.
Hence the 20,000 mAh rating.

The black and decker car battery booster has a 2A USB out but its simply a linear USB device, the 2000mAh batteries will charge my phone once despite its 6 battery setup, i found that very annoying, should be able to charge it 4-5 times.
 "It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

dchomak
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Bort,

I think I have that same B&D Battery Booster. When I used it to charge my phone from about 10%, it charges it up to 100%. But after just 1 charge the LED indicator light goes from Blue thru Yellow to Red. That means it is time to recharge. That in and of itself is disturbing.
But tonight I ran a fully charged Booster thru a resistive load and measured and timed the results. It ran for 3 hours 27 minutes before shutting down. The current wavered around 1.78A and the during the discharge the output voltage was about 4.78V. So during the test the output Watt Hours was
3.5H x 1.78A x 4.78V = 29.78WH

Inside there are 6 Samsung 20Q’s in series, and the WH rating of those 6 cells would be 3.6V x 6 cells x 2AH/cell = 43.2 AH

Buck converters are usually more efficient that boost converters, no?

picture of my unit

Enderman
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dchomak wrote:
You are right, 4Ah = 4000mAh

Most power banks have 1 or more cells in parallel and their voltage has to be boosted to the 5V output that is required. If there were 5 cells in a power bank, each having a capacity of 2000mAh, they would rate the power bank at the sum total of the capacities of all the cells, 10,000 mAh.
Power banks aren’t usually made this way, but if they used those same 5 cells in series and bucked the voltage down to 5V, they would still call it a 10,000 mAh power bank.
18V Ridgid, Milwaukee, Ryobi, etc power tool batteries use 5 cells in series, 21V fully charged. So a 4Ah, 18V battery would have 10 2000mAh cells in a 5S2P configuration.
Hence the 20,000 mAh rating.

Ah I see what you mean.
Bort
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dchomak wrote:
Bort,

I think I have that same B&D Battery Booster. When I used it to charge my phone from about 10%, it charges it up to 100%. But after just 1 charge the LED indicator light goes from Blue thru Yellow to Red. That means it is time to recharge. That in and of itself is disturbing.
But tonight I ran a fully charged Booster thru a resistive load and measured and timed the results. It ran for 3 hours 27 minutes before shutting down. The current wavered around 1.78A and the during the discharge the output voltage was about 4.78V. So during the test the output Watt Hours was
3.5H x 1.78A x 4.78V = 29.78WH

Inside there are 6 Samsung 20Q’s in series, and the WH rating of those 6 cells would be 3.6V x 6 cells x 2AH/cell = 43.2 AH

Buck converters are usually more efficient that boost converters, no?

picture of my unit
!{width:30%}[url=http://imgur.com/J4r26xX][img]http://i.imgur.com/J4r26xX.jpg[/img][/url]!

Very interesting, so that means the indicator lights are wrong, i don’t have one of those current devices but i did go by the lights and recharge time vs current in and came to the conclusion that it was a linear driver instead of a buck driver.
So that means when i think i’m storing it at 40-50% charge (5V USB pulling out 1200mAh) i am really storing it at close to 70%?
I guess the 2 hours to gain less then 1/3 charge means the CV phase is very slow.
Thanks for the info, and I need to completely rethink its discharge level before storage.

Another possibility is that full charge is not 4.2V, if they really thought it through they would charge to 4Vish since most people would store it ready to use. Does that make sense with how much juice you pulled out of it though?

 "It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

dchomak
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Maybe the Red indicator light means it is time the recharge if you intend to use it to boost your car

The thing for me to do now is take one apart, charge it fully and check the voltage across each cell.
Perhaps as you mentioned, full charge isn’t 4.2V across each cell, but something lower.
Also I would like to see what the voltage across each cell is when the indicator light first turns red.

Bort
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dchomak wrote:
Maybe the Red indicator light means it is time the recharge if you intend to use it to boost your car

The thing for me to do now is take one apart, charge it fully and check the voltage across each cell.
Perhaps as you mentioned, full charge isn’t 4.2V across each cell, but something lower.
Also I would like to see what the voltage across each cell is when the indicator light first turns red.

I don’t expect you to go out of your way to do this but if you do i will be very appreciative
 "It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

dchomak
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Bort, I had noticed that the indicator light turns red too after just one phone charge.
It had bothered me also, but I never really looked into it.
Somewhere in this HD thread I did a tear down of this B&D unit and I may have already done some testing.
I can’t remember
This item IS a Home Depot deal, although it wasn’t dealed at all stores at the same time. Some stores may still have them on clearance. It was an \$80 device that I got for \$20.03

I really like mine, I have used it several times to boost the old worn out battery in my van.
Just a couple of days ago I finally got around to replacing it with a \$100 battery that I got at Home Depot for \$24.03 two months ago

Bort
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dchomak wrote:
Bort, I had noticed that the indicator light turns red too after just one phone charge.
It had bothered me also, but I never really looked into it.
Somewhere in this HD thread I did a tear down of this B&D unit and I may have already done some testing.
I can’t remember
This item IS a Home Depot deal, although it wasn’t dealed at all stores at the same time. Some stores may still have them on clearance. It was an \$80 device that I got for \$20.03

I really like mine, I have used it several times to boost the old worn out battery in my van.
Just a couple of days ago I finally got around to replacing it with a \$100 battery that I got at Home Depot for \$24.03 two months ago

I did not consider that the light going red could be wrong, it did seem to add up, half of 2000 mAh battery plus some overhead meaning red light does seem reasonable.
I have not needed it to boost the car yet but what i have been doing is every 3 months recharge then discharge to just before red light so that when i do need it all i have to do is charge and use it. If i’ve been keeping it at a high voltage that would suck.
 "It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

dchomak
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Here is the link to post #1165 of this HD thread that I took the cover off and measured the capacity of a single cell. That’s as far as I got.

http://budgetlightforum.com/comment/926956#comment-926956

Here is an interesting picture from that thread showing what I think is a very sophisticated control board.

I am in the process of doing some further tests of this unit and another power booster I recently picked up at HD for \$19.03
Battery Tender brand and it went on clearance at the same time the CAT stuff did.
http://budgetlightforum.com/comment/1020347#comment-1020347

dchomak
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So I removed the cover and soldered test leads across the 6 – 18650 cells in the pack, then charged it up

Per cell voltage when fully charged is 4.15V

Then I discharged the pack thru the USB connector, with the voltmeter still connected across the 6 cells

Per cell voltage as the indicator light turned Yellow was 4.00V

Per cell voltage as the indicator light turned Red was 3.85V

My take on this is that the indicator lights are tuned towards the suitability of charge for starting your car. The pack should be fully charged for that use, and anything not close to fully charged is considered in need of a charge.
However, for use as a USB power bank, the indicator light is not really useful as there is a LOT left in the pack when it first turns Red. I would say the pack is still about 75% full when the light first turns Red.

The Battery Tender unit did a bit better as a USB power bank. It ran for 3.75 Hours at 4.94V and 1.88A, or 69.5WH

dchomak
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This is not a clearance item, but rather a “new lower price”
Should show up in app queries and internet searches on HomeDepot.com
I checked several areas of the country and it comes up at \$49.00 everywhere I checked.
Yesterday some stores around here had a smattering of them, this morning they were all gone.
YMMV

dchomak
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I finally found one of these

These are now \$3.83 and include a voltage sensor that you can embed in the handle.

Filament bulbs on clearance!

Bort
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dchomak wrote:
So I removed the cover and soldered test leads across the 6 – 18650 cells in the pack, then charged it up

Per cell voltage when fully charged is 4.15V

Then I discharged the pack thru the USB connector, with the voltmeter still connected across the 6 cells

Per cell voltage as the indicator light turned Yellow was 4.00V

Per cell voltage as the indicator light turned Red was 3.85V

My take on this is that the indicator lights are tuned towards the suitability of charge for starting your car. The pack should be fully charged for that use, and anything not close to fully charged is considered in need of a charge.
However, for use as a USB power bank, the indicator light is not really useful as there is a LOT left in the pack when it first turns Red. I would say the pack is still about 75% full when the light first turns Red.

The Battery Tender unit did a bit better as a USB power bank. It ran for 3.75 Hours at 4.94V and 1.88A, or 69.5WH

Fascinating, thanks, i will rethink my discharge for storage
 "It is critical that there is a credible academic source for the growing and important discipline of Alternative Facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists."

garrybunk
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Wow! \$49 for that tool chest sounds like a steal! Can’t imagine it would stay around long at that price.

-Garry

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
sgt253
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You guys are the best! I used the information provided in this thread to buy a router for \$0.1 this morning! Couldn’t believe it. I first noticed the yellow tag marked \$15.03, went to self checkout to scan price. It popped a penny, I went back to aisle where the remaining two were. They were gone from the shelf with the yellow tag removed when I came back. The Electrical Dept. associate observed what I did, he probably scanned the router with his code reader. When it popped a penny he must have taken them. Very few people in store at the time. No other explanation. Either way I am extremely happy! Thank you!

garrybunk
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Why wouldn’t Home Depot have the self-checkouts set off an alarm (or at least deny the transaction and signal for an associate) when an item rings up for a penny? Especially if they’re so dead set on keeping penny items out of consumers hands! It just doesn’t make sense.

-Garry

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
dchomak
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Shhhhhhhhhh!

dchomak
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sgt253 wrote:
You guys are the best! I used the information provided in this thread to buy a router for \$0.1 this morning! Couldn’t believe it. I first noticed the yellow tag marked \$15.03, went to self checkout to scan price. It popped a penny, I went back to aisle where the remaining two were. They were gone from the shelf with the yellow tag removed when I came back. The Electrical Dept. associate observed what I did, he probably scanned the router with his code reader. When it popped a penny he must have taken them. Very few people in store at the time. No other explanation. Either way I am extremely happy! Thank you!

Not \$0.1, \$0.01

Which router? The NetGear?

dchomak
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sgt253 wrote:
You guys are the best! I used the information provided in this thread to buy a router for \$0.1 this morning! Couldn’t believe it. I first noticed the yellow tag marked \$15.03, went to self checkout to scan price. It popped a penny, I went back to aisle where the remaining two were. They were gone from the shelf with the yellow tag removed when I came back. The Electrical Dept. associate observed what I did, he probably scanned the router with his code reader. When it popped a penny he must have taken them. Very few people in store at the time. No other explanation. Either way I am extremely happy! Thank you!

Not \$0.1, \$0.01

Which router? The NetGear?

Garry,

the smaller tool chest to the left at \$79 was what I got on BF for \$59, and I thought THAT was a good deal

Lazy-R-us
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I don’t understand why they use the system that they do either. I have been using the ‘DCHOMAK’ maneuver myself (carrying the barcode from an item to check the price). I walked into a store, scanned a code for the energizer weatheready lanterns, and giggled with glee when it price checked for a penny. The clerk had the audacity to tell my back that she could not let me take the item ‘if it rang up for a penny’.

I carefully ignored her and kept walking into the store, on the hunt, but I had no luck finding any. She may have put the manager on me, as I ran into him several times as I checked various locations. He and I had a little good natured banter and I flat told him I was looking for penny items (this not being a store I go to often, and rarely having any luck anyway). When I left I told him that he should tell his inventory crew they were doing a first rate job, since I didn’t find anything.

He laughed and told me “Thank you, if you are looking for penny deals you should check (other store, in worse section of town), that crew isn’t as good as we are here.”

Thinking about the exchange, I don’t feel bad about getting the penny deals. The stores and the suppliers stack the deck to preclude price shopping. “Yes these two sets look the same, but this one is a 45 piece driver set, the one you have on that web site at our competitors is a 43 piece set.” Sooner or later some smart puppy like DCHOMAK is going to figure out a way to use thier system to the advantage of the customer. Given the amount of crap that I didn’t really need that has followed me home on my 2-4 times per week hunting trips, I think they are still ahead.

Lazy-R-us

Lumenlover
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I saw a Echo 58V blower for \$99. One 2.0AH battery and charger.

sgt253
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dchomak wrote:
sgt253 wrote:
You guys are the best! I used the information provided in this thread to buy a router for \$0.1 this morning! Couldn’t believe it. I first noticed the yellow tag marked \$15.03, went to self checkout to scan price. It popped a penny, I went back to aisle where the remaining two were. They were gone from the shelf with the yellow tag removed when I came back. The Electrical Dept. associate observed what I did, he probably scanned the router with his code reader. When it popped a penny he must have taken them. Very few people in store at the time. No other explanation. Either way I am extremely happy! Thank you!

Not \$0.1, \$0.01

Which router? The NetGear?

Garry,

the smaller tool chest to the left at \$79 was what I got on BF for \$59, and I thought THAT was a good deal

My excitement resulted in the typo, yes \$0.01. Not the Netgear, its a TP-LINK Archer C50 AC1200 Dual Band Wireless Router. Something else interesting happened. Out of curiosity, I asked an associate for a price check on another brand of router marked \$89.00 on the shelf, he scanned it and said \$79.00. Instant savings of \$10.00? Mismarked? Death spiral? I will be keeping an out on that particular one as well.
dchomak
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That could be the very well be. Between the 2 routers on clearance, the TP-Link and the NetGear, I think the TP-Link is the better router. It is dual band

That tool chest that I posted about above was not originally \$99.00 as I stated, it was at one time \$124.00! And before that it may have been even a little higher.
An even better deal than I thought.

As I said, this is not on clearance, but a “new lower price”, although at this price they will be cleared out.
You can check the web site or use your app to check for stock.

mrmatt
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The tool chests are still \$74 in Ky, will be keeping an eye out for the next reduction

dchomak
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mrmatt wrote:
The tool chests are still \$74 in Ky, will be keeping an eye out for the next reduction

Yeah
On Friday I will be passing thru Olean, NY.
As of right now they have 8 in the store, still at \$74.00

carmantl
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Picked up the last one in Knoxville for 49, great deal on a heavy duty (durn near 100 pounds) chest. Thanks to all who posted about it! It’s a shame the matching roller cabinet is still \$149, although I am still tempted at that price.

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Quiet…,,
I’m going in the AM… need a new sander

dchomak
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carmantl wrote:
Picked up the last one in Knoxville for 49, great deal on a heavy duty (durn near 100 pounds) chest. Thanks to all who posted about it! It’s a shame the matching roller cabinet is still \$149, although I am still tempted at that price.

LOL,
Near 100lbs? No wonder a friend called to ask me how I got 2 of them up a flight of stairs at his house. (I dropped 2 off for him)

BTW, \$49 per 100 lbs works out to 49 cents a pound. Heck barbell weights at WalMart even with a price rollback is more.
75 cents per pound!

When buying anything, sometimes it is useful to stop and consider the price per pound.
(just one more piece of data to consider when judging the value of something)

Here is something I NEVER thought to do.
These cabinets being a non-clearance item can be found on the HD app and their website

http://www.homedepot.com/p/Husky-26-in-W-9-Drawer-Tool-Chest-H9CH3/20473...

The first store I found these tool boxes at had 7 in stock. A display and 6 boxed up. I bought 6.
I quickly passed 4 off to friends and had 2 left. Just in case I needed more, I went online a couple of nights ago and found a local store that had 3. The next morning at 6AM they only had 2, so I used PayPal and bought the remaining 2. A couple of hours later they emailed me to let me know they were on a cart by customer service. They next day I picked them up!

EASY.

When I went to pick them up, I saw the third one there also on a cart. Probably also purchased online.
I would think one could buy 1 this way and perhaps pick it up a week later!
My purchase order.

dchomak
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Today I unpacked my first 9 drawer tool chest. It’s huge
That’s an HD2010 on the top shelf for scale.

I like it so much I ordered another online at a store I will be driving by this Saturday. I will pick it up then. Notice that on the order confirmation it mentions that I have until March 3rd to pick it up. That’s over a month, plenty of time to pick an order up at an out of the way store.

Last year I caught one of these carts at the “3” price of \$23.03. Now it seems other stores are starting to clear them out. Here is one still at the “6” price of \$67.06

The newer replacement version of the Ridgid Tri-Stack compressor is also on clearance at some stores. Regularly \$299, here it is at \$207.06. Last year I caught 1 at \$75.03. Could happen again.

A couple of days ago, I was with a friend in an HD and he bought one of these Home ProjectCalcs at \$12.06. I looked at the date and told him they would go to the “3” price any day now. Sure enough, next day they were \$3.83. He got the refund.

CRANK
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Nano lube is down to a penny