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Sunday, May 19, 2013

Harvesting 18650 Cells From Old Laptop Batteries

Lithium-ion 18650 Cell, Harvested From HP Laptop Battery
Definitely Sony
I was reading somewhere that most laptop batteries use 18650 lithium-ion cells internally, and it hit me. I had a laptop sitting in a drawer that died shortly after I bought a brand new battery for it. The battery was about 4 years old, so I took it out and pried it apart. Inside the laptop battery case, as expected, were 12 green 18650 batteries. They are most likely Panasonic. Since the laptop died shortly after buying the battery, each of these cells probably only saw a couple charge cycles-they are almost new!

A quick reading on the multimeter showed that most of the cells were reading at least 3.5 volts. Not bad for sitting in a drawer for several years. The laptop manufacturers must subsidize these cells, because I have 12 cells that cost $10 each, and I know that the laptop battery didn't cost anywhere near that.

DISCLAIMER: Li-ion cells can be dangerous if handled wrong. Don't be a dumbass. I even sparked a couple of my cells because I was so impatient cutting them apart. I'm surprised natural selection hasn't claimed me already. If you have any doubts about what you are doing, stop, and visit the Battery University.

What I intend to do with these cells it to put them into a power pack as a backup/emergency charging system for my electronics. A good power pack costs close to 100 bucks and probably has cheaper cells inside than what I am putting in.

The only real downside is that they are welded together in the pack, and breaking them up leaves these little sharp burrs. I've seen it mentioned where some folks are using a Dremel tool to smooth them out, but I'll probably just use a small file.

Update: As pointed out by Chris below in the comments, these are definitely Sony 2400 mAh cells.

Gallery


12 Lithium-ion 18650 Cells, Harvested From HP Laptop
I had to cut the little plastic bars holding them in
12 Harvested Lithium-ion 18650 Cells, Partially Separated
Partially separated. Be careful cutting them out!

12 Harvested Lithium-ion 18650 Cells, Fully Separated
Fully separated, but each one has some burrs on it. Be careful not to cut yourself!

Sunday, May 12, 2013

Review: Ka-Bar Kukri Machete

I came across this Ka-Bar Kukri when I was shopping for machetes. I have a Kukri from Nepal that my sister gave me, and it's probably the coolest piece of cutlery I own, but it's also a design that dates back
many hundreds of years. A design doesn't get more proven than that.

My review sample was purchased from Amazon, using my wife's Prime account, and arrived here in a
Ka-Bar Kukri Machetecouple of days. Prime is awesome.

This product is made in Taiwan. Most knife enthusiasts are aware that Taiwan has an excellent reputation for knives. Some of the factories there make knives that are easily on par with their American counterparts.

Product Description


This is a high quality machete, though it is made in Taiwan. It features a classic Kukri shape with 1085 high carbon, powder coated steel with a Kraton handle. The blade is a quarter inch thick and the top half of it is swedged.

When first saw this, I thought it looked more like a weapon than a machete. But the reviews on Amazon were great, and I remembered that the Kukri has also traditionally been used for farming as well. The Kukri is a well proven design. Ka-Bar does make a combat version of the Kukri.

Official Specs (From Ka-Bar's Site)

Here is the product link from Ka-Bar's site.














Blade


Ka-Bar Kukri Machete - Closeup Of Blade
The blade is made of 1085 high carbon steel. Because if its high carbon content, this type of steel can rust quite easily if it's not taken care of. That is the reason you will often see knives with a high carbon content steel using some sort of powder coating, like you will find in this machete. Other than that, this type of steel is ideal for hard-use applications like machetes. It holds a good edge and it's very durable.

The shape of the blade I would describe as an exaggerated Kukri shape. It's a little more stubby, with more belly than a traditional Kukri.

In an interesting design choice, the top half the blade is swedged. I'm not sure I see the point (pun intended), though I guess it would help make it a better shovel. But for a machete?

Handle


Ka-Bar Kukri Machete - Closeup Of HandleThe handle is made of Kraton (a form of rugged plastic) and is formed onto the tang. It has a grippy, rubberized feel to it. The guard is nice and wide, and there's a lanyard hole in the pommel. Why you would attach a lanyard to the machete and not the sheath is a mystery. But it's there if you want it.

The handle has a couple other nice features like a Quillion (hook shape) on the pommel side, and the same
grooves they are known for with their classic Marines knife, which dates back almost 70 years.

Overall, the handle has a superb feel to it, which it pretty much needs because of the way the machete is weighted.

Sheath


Ahh, the sheath. At least I knew what I was getting into, since most of the reviews are pretty clear that the sheath sucks. And the sheath does suck. Badly. It's not so much the design that's bad, though the "sandwich" design certainly isn't ideal.

Ka-Bar Kukri Machete - Closeup Of SheathIt's more of the implementation that went wrong. I know people are going to say "that's because it's made in China", but honestly, I own several Chinese knives with superb sheaths. It's more like the sheath is an afterthought every step of the way.

The sheath is basically a sandwich with leather on one side and codura on the other side. At least the rivets at the attachment points seem to be solid. It's not a great sheath, but it's not a danger to your safety either. I would at least trust it enough not to detach and injure somebody, so there is that.


Fit and Finish


Overall, good. I would rate it superb, but I'm taking into account the sheath with my overall impression. The machete itself does have a superb fit and finish, though it did come looking like somebody spilled oil all over the blade. They probably oil the edge, and didn't feel the need to clean up the excess someone spilled. Once I wiped all the oil off, the blade looked great.

There weren't really any flaws of note in the machete itself. The blade came razor sharp out of the box,
Ka-Bar Kukri Machete - Closeup Of Stampthough there were a few very small glitches in the grind. There were also a couple very minor flaws in the powder coating, though in all fairness, the blade does have a huge surface area compared to most knives.

The sheath ... here we are back at the sheath. Mine has too many small flaws to count: nicks on the leather, sewing glitches, irregularities in the "sandwich" and so forth. There are a couple larger flaws in the stitching and sandwiching, too. It's already started to fall apart from light use, so I fully expect this sheath to pretty much disintegrate in the field with hard use. At least I get the impression it will give plenty of warning before it fails, so I don't see it as a safety issue.

Usability


I bought this thing in the winter, and I've been waiting for better weather to go camping and really put this machete to the test. But I do have a huge backyard with lots of trees and bushes, so my Kukri has seen enough use for me to evaluate it.

Ka-Bar Kukri Machete - Stuck In A Stump
As many other reviewers mention, the forward weighting and balance of this machete isn't what I would call intuitive. It definitely takes some getting used to. When I hold it in my hand, I'm not sure it feels right for a machete.

But one swing with this machete, and you will see that the weighting and balance are optimized for swinging it and connecting with things, not for holding it at a standstill. Until you swing it, it's very hard to understand how well the design works.




Conclusions



The best thing about this machete (and the reason I bought it) is that it's more than just a machete. It could easily do double duty as a camp hatchet and triple duty as a shovel. I've heard of it being used for a hammer; maybe in a pinch. As I get older, I tend to go for a lighter weight and more versatility. If I can carry something that takes the place of two things, I'm going to do it.

Ka-bar has a winner here. This machete feels a little different in the hands than what most people are used to, but when you swing it at something, all will become clear. This is just a superb design, which they adapted from an already classic Kukri design.

I wish the sheath didn't suck so bad, but in my opinion it's not a deal breaker or reason not to buy this great machete. I have already decided that if I'm still infatuated with it after a full camping season, then I'm going to find somebody to make me a custom sheath.

Other Thoughts


I read in one of the reviews where Ka-Bar's Cutlass machete is better suited to backpacking because it is lighter. Since the Kukri might be overkill in some camping/hiking scenarios, I plan to buy the Cutlass version soon.

Gallery

Ka-Bar Kukri Machete - New In Box
The box was kind of beat up.

Ka-Bar Kukri Machete - Open Box

Ka-Bar Kukri Machete - Unpacking The Machete




Ka-Bar Kukri Machete - In Sheath
The sheath looks great from a distance

Ka-Bar Kukri Machete - Another View In Sheath

Ka-Bar Kukri Machete - On Deck

Ka-Bar Kukri Machete - On Deck, Other Side

Ka-Bar Kukri Machete - Closeup Of Pommel
I have no idea what the "1249" means

Ka-Bar Kukri Machete - Closeup Of Pommel
Closeup Of The Pommel

Ka-Bar Kukri Machete - Closeup Of Awful Stitching
Closeup Of Stitching

Ka-Bar Kukri Machete - Closeup Where The Spine Meets Blade

Ka-Bar Kukri Machete - Closeup Of Belt Loop
Closeup of belt loop

Ka-Bar Kukri Machete - On Digital Scale
On Scale: 1 pound, 10.1 ounces

Ka-Bar Kukri Machete - In Medium Size Hands
Shown in my medium size hand

Ka-Bar Kukri Machete - Closeup In Medium Size Hand
The handle is a little big for my medium side hand, but the hooked pommel helps the grip

Ka-Bar Kukri Machete - With Authentic Kukri From Nepal
Shown with a traditional Kukri from Nepal
Ka-Bar Kukri Machete - Next To Sheath

From Top: Ka-Bar Kukri Machete, Cold Steel Tanto GI, Ka-Bar Becker BK14 Eskabar
From Top: Ka-Bar Kukri Machete, Cold Steel Tanto GI, Ka-Bar Becker BK14 Eskabar

From Top In Sheaths: Ka-Bar Kukri Machete, Cold Steel Tanto GI, Ka-Bar Becker BK14 Eskabar
Ka-Bar Kukri Machete - Flaw in Belt Loop
A nice little flaw in the belt loop of the sheath

Ka-Bar Kukri Machete With Nitecore EA4, Sunwayman M20C, Maxpedition EDC Organizer
Let's go camping!
Ka-Bar Kukri Machete - Sandwich Sheath Falling Apart
Here you can see the sandwiching on the sheath separating after only light use

Saturday, May 4, 2013

Review: Solarforce X3 [AAA Flashlight]

I saw this light in a post over at the CPF forums a few months ago and I have wanted one ever since. So, recently I bought one from lighthound. The first unit I received was defective but lighthound took care of me, and got a replacement unit right out.

SolarForce X3 AAA Flashlight

Product Description

Price: Mine was $27 shipped

The X3 is a single mode, stainless steel, LED "twisty" flashlight, which takes a single AAA battery and uses a Cree XP-G R5 emitter. Solarforce seems to be shooting for a higher end fit and finish with this model. I would almost call this a gentleman's keychain light.

Official Specs (from their web site)

Constructed of S304 stainless steel
CREE XP-E (R4) LED with lifespan up to 50,000 hours
Strengthened ultra-clear glass lens with two-surface coating
Battery type: AAA (alkaline or rechargeable 1.2V) x 1pc
Structural reversed polarity protection
Output: 50 lumens
Continuous runtime: 1 hour
Able to stand on its tail
Water proof
Dimensions (L x OD): 73 x 13mm
Weight: 30g (without battery)

Head / Bezel


SolarForce X3 AAA Flashlight - Closeup of Head
Here you can see the reverse polarity protection
SolarForce X3 AAA Flashlight - Closeup of Reflector
The emitter is well centered on mine
The head of the X3 appears to be brass. I am not sure, but I believe outer finish is Nickel, not steel. It looks like steel at first glass, but on closer inspection, it just doesn't look right for steel. Again, I'm not sure. The threads are the typical triangular threads you'll find on any budget flashlight.

There's a cross hatch pattern on the head to provide good grip for twisting the light on and off. In practice, the head is a little tight for one handed operation.

The reflector is a textured orange peel style. The texturing looks very non-uniform, but it's effective. I might also be wrong about this, but it sure looks like the glass has that telltale purple tint of anti-reflective coating, which I don't think I've seen on an AAA flashlight.

SolarForce X3 AAA Flashlight - Beam ShotBeam


The beam on my sample is very smooth, and slightly floody, due to the textured reflector. The rings and
artifacts are minimal. It's a very workable beam and probably ideal for a keychain light due to the wide hotspot and lots of spill.

The tint on my sample is cool white; not greenish or yellowish at all.

SolarForce X3 AAA Flashlight - Closeup of Body
Threads on the body are well machined

Body 


The body appears to be a solid chunk of stainless steel, with a reallly nice polished finish to it. Inside the body at the tail is what appears to be a steel pin with a foam ring around it. It's an interesting design choice.
From what I can tell, this design isn't a "battery crusher" like some other foam ring designs.

Tail


The tail is a typical keychain carry tail, slightly widened to supposedly allow for tail standing. You could just as easily attach a lanyard, lobster claw or other similar widget to it. This light is made to dangle.

SolarForce claims this model can tail stand, but my unit can't. What's interesting is that the first defective unit I had could tail stand. But the replacement unit has the tail more rounded than the last sample I had. I can't get this one to tail stand no matter what I do. But that's OK, the tail is fine for a keychain light, maybe even
SolarForce X3 AAA Flashlight - Closeup of Tail
The tail has a nice look to it
ideal.

Run Time Test


I did my run time test with a second generation Eneloop AAA cell hot off the charger. The light went full steam until it started to dim noticeably at 1:40 and by 1:50 it was sub-lumen, where coasted down until 2:45. At that point it started flashing, and remained flashing until around 4:30. That's right, this thing put out some form of light for almost 4 1/2 hours. 

Fit and Finish


Overall, good. My only couple gripes revolve around the head. The steel finish looks good, but there's just something off about it. There was also a good amount of dirt and grit in the threads.

But those are minor gripes. The X3 has an above average fit and finish for the price range. The threads on the head and body are well machined, and the finish on the body of mine is almost immaculate. There were no scratches, tool marks or noticeable blemishes in the finish. The laser etched text is a little hard to read, though. I personally think it would look better with less text on the body. 

But all things considered, it looks like SolarForce really paid attention to detail with the X3. My sample looks sharp.

Usability


Due to the tightness of the head, it's difficult to use this light for every day carry. But other than that, the X3 has a very usable beam, a solid feel, and well, it kinda looks cool. The efficient circuitry will give you more run time than a comparable one mode AAA flashlight for that output.

Conclusions


The X3 in my opinion is better suited for keychain carry than every day carry. This seems like a nearly ideal keychain flashlight: simple, rugged, effecient. And the tight head, which makes it hard to operate one handed, is preferable for a keychain light, which tend to have the heads work their way off, never to be seen again.

I am currently deciding whether to replace the Fenix E01 on my truck keychain with the X3. And I will most likely be giving a few of these away as gifts.

Gallery



SolarForce X3 AAA Flashlight - In box: frontSolarForce X3 AAA Flashlight - In box: back
SolarForce X3 AAA Flashlight - Open Package
SolarForce X3 AAA Flashlight - Closeup of Head

SolarForce X3 AAA Flashlight - Another Closeup of Reflector

SolarForce X3 AAA Flashlight - With Eneloop AAA Battery
SolarForce X3 AAA Flashlight - BlackShadow Eva AAA flashlight
With BlackShadow Eva AAA flashlight

SolarForce X3 AAA Flashlight - Closeup of threads
Closeup of the threads: well machined but dirty
SolarForce X3 AAA Flashlight - Moon glow
This was taken at about 2 hours even into the run time test
From Left: BlackShadow Eva, Olight I3S, Solarforce X3, Thrunite Ti2, L3 Illumination L10 Nichia 219, L10 with XP-G2
From Left: BlackShadow Eva, Olight I3S, Solarforce X3, Thrunite Ti2, L3 Illumination L10 Nichia 219, L10 with XP-G2

SolarForce X3 AAA Flashlight - On Digital Scale
1.4 Ounces with a 2nd generation Eneloop in it