[Sold out] 8 Purple Samsung ICR18650-28A $10 shipped

They call it a battery for a Dell, not an original, authentic Dell. So it probably has junky “UltraFire” type cells in it.

thank you for the guide demi god… i would have never been able to open this thing without it

it seems i nicked the wrapping of EVERY battery… beginners luck!

i covered any gouges with elec tape for now… i guess ill invest in some wrappers from illuminationsupply soon to rewrap the cells

charging them all up now

how do you guys remove the 4 burrs that are left at each pole? or do you leave them there?

i guess i just worry about a small piece of metal becoming dislodged and causing a short.

That would have 2 banks of 3 cells in series. so 4400mAh/2 = 2200mAh cells

Based on the description I’d agree 100% with dchomak, it is a cheap aftermarket replacement and will have inferior cells. But, not all aftermarket replacements use cheap cells. It the states we have brands like Denaq or Maxcapacity that are quality replacements using high quality cells. Check out this interesting video of a battery factory tour. At one part they speak of a Polish branded pack using panasonics…

No problem, I was like wow this pack is impossible to open compared to all the other packs I ever opened. For the metal burrs on the end, I used my dremel and slowly sanded them down, then used my hft stick polish and the dremel cotton buffer disc and made it nice and shiny! Better than brand new looking!

What’s the capacity of this 4.35v battery when charged with 4.2v charger?
Is this equation not applicable?

2800 mAh * (4.2/4.35) = 2703 mAh — only 100 mAh less

No, look to this site for the reviews: Test of Samsung ICR18650-28A 2800mAh (Purple)

Essentially they are really approximately 2600mAh, and when charged to 4.2, approximately 2400mAh.

No. The battery isn’t flat at 0V and the discharge curve isn’t linear.

Look at some of HKJ’s battery reviews, he actually shows the amount of current (and also energy) batteries put out when discharged at different rates. For 4.35V batteries, he shows that information for the battery charged to 4.35V as well as for the same battery charged to 4.2V.

Thanks B42, GregY.

According to the linked page, this is not 2800 mAh but
2600 mAh w/ 4.3v, and 2400 mAh w/ 4.2v.

Under ’Test with 4.2 volt charging”:
When only charging to 4.2 volt the battery looses about 220mAh in capacity.

[EDIT]
HKJ
09/20/2012

Test / Review: Samsung ICR18650-28A 2800mAh (Purple)

Just finished capacity results on the first 2 batteries.Both charged to 4.16 volts with the i4 charger. I used the LittoKala Engineer 260 for discharge capacity and internal resistance and results are very good.
Battery 1 IR = 53 and 2380 MAH
Battery 2 IR = 51 and 2409 MAH

I’m not sure how accurate the IR numbers are from this LittoKala battery tester,but brand new panasonic cells are in the same range as these batteries.My conclusion is that these batteries are slightly better than the Panasonic CGR18650CG that I got last week.They measured 2210 MAH and in the low fifties IR values.I do have some very old sony laptop pulls that are supposed to be 2250 MA and only measure 1100 MA and the IR values are over 100.

moT -> GENIUS w/ that bench grinder suggestion!

I’m really glad I happened to read ur post b4 opening my pack w/ hand tools. After reading ur post I went to my grinder & ~15 minutes later (probably took that long b/c I kept checking to not grind too deep into the pack) the pack opened up like a can of sardines! My fingers especially thank you (probably my last pack was a real boar to open w/ hand tools.) I didn’t open up the pack any further after getting the plastic shell open. I’ll save that for tomorrow when I’m fresh and alert.

Anyhow, great call on using a grinder. :slight_smile: I’m definitely going to use these method for opening pretty much ALL future packs.

((partial quote))

Glad it worked well for you too.

On my second pack i target the slowest first the two sides of pack at the ends of cells. then the two inside corners near the connector in the front. After its just seconds to complete the rest of the front. Take a few shallow passes across the back to make a bend point. Otherwise your can of sardines will try to keep the lid closed. :bigsmile:

Here’s a bench grinder for you:

http://pad1.whstatic.com/images/thumb/4/43/Use-a-Bench-Grinder-Step-1.jpg/670px-Use-a-Bench-Grinder-Step-1.jpg

Dats seen a few battery packs. LOL

Opened up my pack today. All went well and all 8 cells showed 3.66 volts.

Great Buy !

That was definitely the hardest pack to open that I have done, they seem to be new with all new packaging and good cells, one tiny spark in opening, all test 3.66.

good batteries at an excellent price…it could be the best deal of the year!
I need more of these cases to hold them, with 2 more pack coming my way :smiley:

Lol, that's what I thought after opening the first in a little over 45 minutes. I looked at the other 5 packs I had and said wt-f!!! Actually was very tired and thinking I should have just stuck with my regular brand new panasonics I had ordered previously, instead of opening these packs. That's why I created that guide a few pages back trying to help out whoever else was having problems opening up these Acer packs, which by long and far, were the hardest laptop packs I ever opened.

Does anyone ever wonder where these sellers get these stuff?

For $10, probably half covers shipping. So - $5 gross per piece of original Asus battery pack? That means the item cost less than that?

Doesn’t make sense to me.

He had a bunch of Asus laptops as well. All of it was likely purchased in a single lot. Batteries were too old for Asus to sell retail anymore for over $100 so they were wholesaled off with a bunch of older Asus laptops.

Don’t look at it as he got those batteries less that $5. He purchased that whole lot for $xx and plans on making profit off the laptops. What he got out of this sale and the BLF feeding frenzy was cash flow. 163 packs @ $10 = $16,300 in cash flow (in 2 days!) to spend on another inventory lot he wants. This was one happy seller.

Anyway I was pleased to see these batteries go to hobbyists rather than profiteering like these batteries.