Using Aftermarket 18650 Lithium Batteries in a Rechargeable Garden Tool

Let me start out with saying the lawyer words:

This is at your own risk.

The batteries I am using are Lithium Ion batteries scavenged from (one or more) laptops.  If you puncture, overheat, or otherwise damage one of these batteries it is possible that they may catch fire.

Do not short circuit these batteries.  Use a charger designed for these batteries specifically.

This is at your own risk.

The Science Words:

The batteries were scavenged from laptops, and you can get 18650 batteries online that will be of full capacity.  I am using scavenged batteries because I had a couple old laptops that were going to be recycled.

From what I have learned, you can not charge these Lithium batteries in series.  Connected as a block, the batteries will overheat when charged and they may catch fire.  The circuitry in a laptop will charge the individual cells separately.

They are 3.7 VDC cells, which makes them attractive for this project.  The saw took 14.4 VDC which is four cells.  I had 4 2 cell blocks which gave me more amperage to push into the saw.

I get around all the warnings doing it this way because the cells can be removed, and charged individually in a charger made for 18650 Lithium Ion batteries.

Or so it says when I bought it from a Chinese Supplier – and we all know how trustworthy Chinese Suppliers can be.

Or not.

Sarcasm aside, here’s how I did it.

I had a Saw that was given to me as an oddball item.  No battery pack, No Charger.

I had all these batteries.

I ordered the battery holder (that black thing with the blue cells in them) for emergency purposes.

Connecting four batteries gives me 14.4 VDC so I was able to test the saw by connecting the terminals directly.  The motor worked.

Waiting for a reason to heat up the hot glue gun, I decided to do this one sunday morning.  It took me about an hour.

Step 1 disassembly.

Remove all screws and set the mechanicals aside.  I was lucky that the parts did not fall out onto the table when I went to open the saw, and nothing was plastic welded together.

Luckily, the electronics were simple, and the plug into which the original battery pack was to fit was obvious.  I could slide that connector out and solder my battery pack to that connector permanently, glue the battery pack in place, and screw things back together.

The placement of the new battery pack was by eyeball, and made sense to me.  Your placement will probably vary.  See my last picture for what I’m getting at.

Step 2 solder the connection.

I realized I could thread the two wires from the battery pack through the air vents in the side of the saw without drilling holes.  Of course, if you are modifying a different tool, your placement will vary.

Using Hot Glue, I was able to attach the battery holder to the side of the saw and only covered up one of the multiple screw holes on the side.

When that was placed, then I could connect the block’s wires to the Red, Positive connector to the Saw’s Electronics with Solder.  Red-to-red – to keep the polarity of my connections correct.

I then did the same for the Black, Negative connection.  Again, Black-to-Black to keep the polarity of my connections correct.

I did a test to make sure that the wires were soldered to the connector block like in the picture above.  The motor groaned to life, the wires held, and I noted that the batteries needed a charge.

I then disconnected all of the batteries and wrangled the connector block back into place, seated the wires, and screwed the Saw back together.

Step 3 the finished product.

Once I seated the wires inside the saw back in their original channels, I could close the unit up back as normal.

After it was placed back together, I tested the saw once again and everything worked.

Great!

Step 4 Why I did it this way instead of getting a battery pack.

So yeah I could have thrown money at this saw.  The thing was that I knew that I would not need it much.  Having a lot of these batteries around, as well as the battery packs from last Hurricane Season, I knew that I could rig a lot of this sort of thing together.

I had a couple of other tools in the shed that I could have done this with, but the Saw was the only oddball that ran at 14.4VDC.  The other tools were powered by 18VDC and we had gotten a charger and a battery for them.

So my red saw being the only odd man out was going to get “hacked”.

Safety would dictate not doing it this way, but I do have the batteries, and I did have a little better than basic knowledge of electronics being able to replace individual components on an electronic appliance.

“I do board level repairs” on electronics, when they are readily apparent as to what needs to be replaced.  This kind of a mod is trivial.

It rendered it “more safe” because the batteries are taken out of the unit and charged separately.

But ultimately this kind of thing is at your own risk since it is what a pharmaceutical would call an Off Label Use of the product.

But really ….

Advertisements

Today in church they asked what a Bishop does. Apparently “move diagonally” wasn’t the answer they were looking for.

Hungry?  You won’t be after this…

 

A KINDHEARTED OLD LADY

A tour bus driver is driving with a bus load of seniors down a highway when he is tapped on his shoulder by a little old lady.

She offers him a handful of peanuts, which he gratefully munches up.

After about 15 minutes, she taps him on his shoulder again and she hands him another handful of peanuts.

She repeats this gesture about five more times.

When she is about to hand him another batch again he asks the little old lady, ‘Why don’t you eat the peanuts yourself?’

‘We can’t chew them because we’ve no teeth’, she replied.

The puzzled driver asks, ‘Why do you buy them then?’

The old lady replied, ‘We just love the chocolate around them.’

Where does Poland keep its armies? Up its sleevies.

I don’t care for Ethnic Jokes, so I don’t generally put them here.  Not that the topic was anything but your basic pun.

Basically, I have a couple hard and fast rules.  Has to be “broadcastable” on US TV even in a repressed area such as your basic republican red state.

Dad Jokes are good for me.  Your basic dumb pun works great.

Oh and it has to make me laugh, and that’s not really a test.  I laugh often.

 

 

A man walks into a bar.

 

The barman asks “Why the long face?”

The man replies “I just found out my wife is sleeping with another man. So I have decided I’m going to drink myself to death.”

The barman looks shocked and says “I’m sorry I can’t help you commit suicide at all let alone in my pub!”

The man asks “Well what would you do in my situation?”

The barman leans in and says “If I found out a guy was sleeping with my wife I wouldn’t sit around feeling sorry for myself, I’d kill the guy.”

The man jumps up from his stool and shouts “That’s a great idea! Thanks!” and runs out of the pub.

A couple hours goes by and the barman is starting to get nervous when the man walks back into the pub with a smile on his face.

“Did you kill the guy?” The barman asks nervously.

“Nope! I slept with your wife. Whiskey please.”

Teaching Rack to Eat – A Slow Eater Gets Much Better With Water and Heat.

Rack is a fascinating character.

My dog, Rack, has some quirks.  Some of those quirks are endearing.  He greets me in the house, despite other people living there, first.

Mind you since I’m the one that tends to grab the heaviest bags from the back of the car, that’s not always comfortable.  That wet nose has found itself in places it never should have been.

He sleeps in his bed, but only until I have drifted to sleep.  Many nights, in the glow of the clocks and

Dogs live by their noses, and will curl up next to their favorite people, and barring that, their clothes so

that they are comforted by the scent.

lights in the bedroom, I open an eye and see that he’s moved to the bath mat I keep next to the bed and my boots.  I would have thought it is more comfortable in his bed that is chock full of foam rubber, but he’d rather curl up on a flat mat next to my shoes and my bed.

Ok, Boy, as long as you don’t chew anything.

But one of those quirks has bothered me since day one, and is something I will have to watch for the rest of his time.

Food.  He’s a terrible eater.

Many dogs are too fast.  They eat so fast that they bloat and you end up turning the bowl over, or get a Maze bowl to force them to slow down.

Lettie was fine, although she was a bit too quick on snacks.  Just watch your fingers, she thought her snout was shorter than it actually was.

In Rack’s case, Food is an Afterthought.

He has severe food allergies.  Grain and Poultry are a definite no.  We went through quite a few meals followed by projectile “Soft Serve” and diarrhea until we figured that out.

Cheap food is full of grain.  Dogs don’t need grain.  They are omnivores, but more toward being a carnivore than we are.  So cut out the grain.  Chickens and Turkeys eat grains.  So whatever was in that grain gets stored in the muscle tissue, and whatever else, that is used to make the dog food and more “Soft Serve”.

We found a couple of foods that he could eat safely, but the damage was done.  He gets extremely picky.

Since one of the foods was a dry kibble, he would take as much as a half hour or more to eat on a normal feeding.  Twice a day and I was spending an hour tapping and shaking the food bowl to motivate him to eat. I would get frustrated, start nagging him to eat.

Not good.  Nobody likes to be nagged.

So I hit on an idea.

Take the food in the bowl, ours is purple plastic, and add an ounce of water or so.  Just enough to puddle a little bit in the bottom of the bowl.  Coat all of the food with the water.  Shake and stir it around.

Then microwave it for 15 seconds.  Just enough to warm things.

The last dry day he had was 27 minutes of crunching.  Lettie would have had that done in short order and ask for more.

The first wet day he was done so fast that I had to do a double take.  It took three minutes.

So the rule is that he gets bored and needs variety.

The main rule is that even just an ounce of water to warm and soak things is a help.

Reading this you may say to “Give him 10 minutes then remove the food, he’ll eat when he’s hungry”.

No.  “I mean are you stupid? No.”

I have a dog with a very low prey drive, and a very low food drive.  He will starve himself.  As in “I’ll lose 20% of my body weight and still ignore that food.”

It simply is not a priority and removing food from a dog is unnecessarily cruel.  Better to try something positive and see if you can change things.
Of course we’re also dealing with a dog who was still growing when I got him from the rescue, so he

You see, Puppies are wonderful and beautiful balls of love.  However taking a dog away from Mom means that it does not learn what is acceptable in a pack.  Feeding is one of those things that is effected and you end up with a painfully fussy dog.

He was almost certainly taken from his mother early and not socialized properly.

When your pup is in a pack of 8 brothers and sisters, you eat or you go hungry.  Being picky means failure to thrive.  If you aren’t taught that lesson, it may linger.

In our case it did.

So a little water, and 15 minutes in the microwave may just do the trick.  It did with us.

My Town Is So Small that our crazy cat lady only has one cat.

Yesterday two dogs.

Today, A Cat and a Dog.

Yes, you could say this is a dog of a joke.

Sniffing Dog

A man boards a plane and is seated next to an Air Marshall and his ‘sniffing dog’. Soon, the plane takes off and the Marshall says, “Sniffer, search.” The dog walks along the aisle, and stops next to a woman. He then returns to his seat and puts a paw on the Marshall’s arm.

“Good boy,” says the Marshall.

“What happened?” asks the man.

“That woman is in possession of marijuana. We’ll arrest her when we land.”

Once again, Sniffer searches the aisles. He stops beside a man, then returns to his seat, and places two paws on the Marshall’s arm.

“That man is carrying cocaine,” the Marshall explains.

The dog walks up the aisle again, then races back, jumps into his seat, and poops all over it.

“What’s going on?!” demands the man.

The Marshall nervously replies, “He just found a bomb!”

Jokes are like puppies. If you have to pull them apart to see how they work, they’re not as fun.

Yeah I know nasty little groaner for the topic here today.  It’s similar to a Groucho Marx joke:

Outside of a dog, a book is a man’s best friend. Inside of a dog it’s too dark to read.

Too bad the TV doesn’t rerun those old Marx Brothers’ movies here any more!

 

 

 

A boy is walking home with groceries and his border collie and he comes across a pool of toxic waste.

Absolutely shocked at this sight, he dropped his groceries and let go of his dog.

His dog wasn’t the smartest, and it jumped into the toxic waste.

The boy’s groceries also fell in.

After finally recovering, the boy called the cops to report both his dogs death and the toxic waste.

When the cleanup crew arrived, they thanked the boy for reporting the spill, and apologised because they couldn’t find his dog.

However they did find that his watermelon had grown a snout and tail, and seemed to look like his dog.

Suddenly, the watermelon started barking and running around.

Somehow the watermelon he had bought and his dog had combined.

He picked up the watermelon/border collie and hugged it, and it licked him back.

He embraced the melon-collie

The Colder The Weather, The Tighter The Dogball

Cold is relative.

No really, it is.

You ask someone who lives in a place where they get wild swings of temperature when you don’t, they may tell you you’re crazy.

But if your dog gets cold, it gets cold, no matter where you are.

In my case, my dog got cold, and so did my relatives.  Rack, the McNab SuperDog (TM), handles it in style.  He simply rolls up into a dogball and parks himself in the corner.

He does it wrong, but he doesn’t care.

Last night, watching an old sitcom, I saw the ritual of the nest.  I’ve got a mat for him to lay on to protect him from the cold slab that the house is built upon.  Yes, I know, Cold is Relative.  In this case, it’s relative enough for me to be wearing a pair of Doc Martins any time I am not in bed, or a shower, or shaving in front of a mirror.

But that’s normal for me.

The one time I tried to put my own Docs on my dog’s feet, he looked up at me with all knowing brown eyes and basically told me I was an idiot.  Taking one foot out of each shoe, he slipped away.

Good for me, I was able to finish dressing.  Sitting on the edge of the bed means that I generally have a 46 pound, badger black and white dog weaving his frame in and out of my legs.  Like a cat.  Which I can’t.  I’m allergic to cats.  That’s why we have a dog.   A Good Dog indeed.

Who’s a good boy?  Hmmm?  You are!

So as he’s pawing on a mat that has to weigh as much as a bag of flour, not having much luck, and basically making a mess, he manages to roll it up into a ball.  Then, Plop! He’s settling in next to it to sleep.

That Dog Sniffing His Tail position that McNab Dog owners are so familiar with.  The tighter the dogball, the colder the weather.

But cold is all relative.  My relatives.  One in the Philadelphia Area, My Sister Pat at least doesn’t laugh at me when I tell her it’s cold out.  She does remind me that while I may be feeling cold and it’s 50, I also went to Kelly Drive and would have a skate workout when there was ice on the trails in a T Shirt and Boxer shorts with a sweatshirt if it was windy.

Just a short workout, mind you, only 9 miles, but you can do it too.  Come on, it was only 25, and I wasn’t crazy.  Really I wasn’t.

The other one is in the middle of the great plains.  The Middle of Nebraska.  Les Nessman’s dream state.  Where it was minus-freaking-25 Farenfreakingheit.  Too Freaking Cold.

So cold that it doesn’t make too much sense to take the effort to convert the temp to Celsius because it is roughly the same.  And my mind may be going from all that cold anyway because I could be getting the temperature wrong, oh never mind, let me have my damn coffee, it’s too cold to think about that!

Replace Freaking with whatever intensifier you wish.  I have one in mind.  Four bold letters.  Describes the situation perfectly.  Survival gear to go to the mailbox cold.

No.  Just No.  I’ll take solace in that it will only get colder here, and we’re expecting two degrees above freezing.  Yes, 38F or 2C.

So this is the dry season.  How I know is that it has been raining for two days in a row, and my banana tree sprouted a flower that just popped open.  Just in time for near freezing temperatures.

The storm forms in the Caribbean, where the water is still warm, relatively.  It does that pirouette dance to spin up into what my Sister will be calling a Nor’Easter, and wondering if it will get above freezing before the storm hits there.

Dunno, Pat, I remember once riding my motorcycle this time of year through the NJ Pine Barrens with just a T Shirt and Jeans because it was 70 with snow banks on the side of the road and ice patches in the shadows.

Dress for the Slide, not the Ride.

So it’s all relative.  I will hide from my cold.  You hide from your cold.  Here, have some coffee.

Did I tell you that the freeze line is 8 miles north of me?  Yeah, Clint Moore Road in Boca Raton according to the National Weather Service is as far south as freezing temps get.

Take that Boca!  Hah!