The New Chargie C, Fast Charging and Battery Degradation

One of the best perks modern society has is the instant fulfillment of everything: one-hour home delivery, home office, ultra-fast charging of batteries of devices ranging from smart watches and phones to electric cars.

picture (c) techadvisor

Electric cars and phones are not much alike, when it comes to battery management. The first have huge battery capacities and don’t ever fully charge nor discharge, have complex management and cooling systems, while the latter are mostly glass slabs with huge processing power and no cooling. What’s even worse is that they’re most of the time covered in a heat-insulating plastic cover. Why is that worse? It’s not for the phone’s aesthetics, obviously, but for the battery.

The lithium ion batteries used in mobile phones and tablets are made from organic materials that have a high sensitivity to heat. And it doesn’t have to be boiling, 50°C (122°F) for prolonged times is enough to provoke complex changes in the thin layers of compounds ever present in a rechargeable battery.

One change today, one change tomorrow, the events start to chain and changes add up. There’s the perfect recipe for destruction and one day you check your iPhone’s Settings – Battery – Health menu and instead of the 100% before that holiday road trip there’s now 97% in little over three weeks. Why did that happen?

Well, of course, the fact that you navigated the entire 3000+ miles using your phone mounted on the dash in full sun might surely explain it, but it also happened to your friend who charged it religiously to 90% every night, using a Chargie device (right?) and an original fast charger.

So, what gives?

picture (c) avast antivirus

It’s the heat. Of course that travelling with a dash-mounted phone kills the battery, everyone knows that (right?). The thing might even swell and ruin your screen. It might even catch fire, like it’s been the case for some. But even if you use overnight charging to 80 or 90%? Why is that?

Again, it’s the heat. Had it not been for the Chargie, the degradation would’ve been some 10% higher, but even so, after a year using a fast charger every night, the battery still went down to 94%.

Fast charging is glorious

That rewarding feel that you can connect your phone to your 30/50/65+ watt charger and while you shower, brush your teeth and have a sip of coffee, your phone is already at 90% and you can go. Pretty amazing, right? It is. For only so much time.

Phones already have this software protection that kicks in when the battery reaches a certain temperature making the charge slow down. Or, after some 80 to 90% state-of-charge, it lowers the current to protect it from egregious degradation (it’s written in their chemistry).

But that’s not enough for a long lasting phone’s aspirations.

Mark my words: every time you fast-charge your phone and shave some 10-15 minutes off charging time, you lose much more capacity than you imagine. Some 0.05-0.1% more exactly. Which is a lot. Because you charge it maybe twice a day, 365 days a year, and then you don’t cool it to room temperature, but put it in your pocket, inside its protective case.

For a comparison, a Pixel 3a charged/discharged continuously in our lab for 24/7 with the screen permanently on, between 30 and 85%, only lost about 1% in a year. Which is almost nothing. It came with 98% new, now it’s at a steady 97%. But it rarely got hot because of charging. And it almost never got full.

Electric car owners can confirm this: those who supercharge a lot get more battery degradation than those who usually do it at home with a slow charger.

For phones, charge limiting with a Chargie device can only do so much if you continually heat up your phone every day. Chargie wants, above all, to make overnight charging safe and desirable. Its Scheduled Charging option helps a lot, but a slow, 5V/2A charger can greatly supplement Chargie’s protection capabilities.

Introducing Chargie C Basic (for phones)

The new Chargie C Basic (rendering)

New charging standards will almost surely implement the USB-C connector and along with it, the PD fast charging technology. Which is not new tech, the Qualcomm QC3 and QC4 did fast charging, and so did OnePlus’s Warp, but PD is more universal, more high-voltage and can power everything up to laptops and monitors with 100W (20V/5A) of juice. Well, that’s good for laptops, but not for most phones.

That’s why our new Chargie C Basic will make PD hold its horses to some 8 watts, more than enough to juice up any tablet or phone during the night. Effective charging time is only 20% slower for an iPhone or a phone with similar battery, whatever type of charger you’re using. I made this decision because otherwise people would charge up their phones using full PD speeds, batteries would degrade and everyone would blame Chargie for not doing its job properly. Well, if you really want PD charging and you’re in a hurry, please do it directly, not through Chargie.

At 8W, charging performance will not get throttled, your phone’s heating curve will be much reduced and its lifetime will extend beyond the manufacturers’ projected 2 years. Chargie C Basic (for phones) will continue to fast-charge using QC3 and QC4 chargers, in order to remain compatible with older charging tech and phones.

Here’s a preorder page for the new Chargie C Basic. You can read more about Chargie’s updated specs here. Get in the waiting line now for 20% off with the coupon code “ChargieCLaunch” – limited to the first 300 orders.

How to Use Chargie to Future-Proof Any Device’s Battery (not just smartphones)

Oh, that battery!

Aside our phones, most of us have a multitude of battery-powered devices laying around… not really using battery, but plugged in all the time.

After a while, that Bluetooth speaker, smart radio, smart watch, drone, your kids’ LEGO battery pack or even flash light… will not have the same battery it did when it was new. That’s because they’ve been kept plugged in A LOT. Which sucks, if you ask me, because it shouldn’t be like that – you should just plug them and they should stay healthy, since you don’t have to worry when to unplug each and every device you have around your home.

Chargie’s autonomous charging limiter to the rescue

If you read Chargie’s description, you already know what it does – it saves phone batteries. But few people know that since December 2020, Chargie does more than that.

Let me explain what and how:

Introducing Chargie’s Hardware Limiter

Chargie’s hardware limiter, or CHL, is a function of a physical Chargie device that works autonomously, without needing a connected Chargie app. It measures charging power all the time for you and, when it reaches your set custom threshold, it cuts off power.

Why does it do that?

While your batteries are charged to 100% or 4.2 volts, the voltage difference between the charger and the battery drops, and the current flow becomes lower with each minute. It’s a natural phenomenon, if you like. Like Elon Musk said once, charging a battery is like trying to fill a water bottle – when approaching its capacity, you have to reduce the flow.

Chargie uses that to do charge limiting on any battery. Your Chargie device analyzes power constantly, makes an average over the last few seconds, and sees when the charging current drops below a limit that you set in the app (and that gets written to Chargie’s internal flash memory, in order to be app-independent). It then cuts off charging and waits for the battery to discharge. You will also set the discharge waiting time.

And that’s it. You can now set the threshold to some 1W and charge your radio, Bluetooth speaker, smartwatch or whatever device you have through Chargie. Some of them are not smart devices, others are. Chargie simply doesn’t know or care – it just does the job of keeping that battery healthy for years to come.

A speaker isn’t a mobile phone, and it shouldn’t have its battery swelling or degrading after a while. You can use your speaker for 10 or 20 years without any other issue than its battery. And battery shouldn’t be an issue any longer if you use a Chargie.

Older phone or GPS?

There are people who still use older non-smart phones, or GPS devices. For all of them, continuous charging or keeping them on the car’s dash in the sun, battery swelling is an issue. A very dangerous issue, if you keep using them like that. There have been cases of fires and explosions.

Chargie’s autonomous charging limiter does away with all of that. By keeping the battery at some 50%, batteries will most likely not swell and they surely won’t explode.

So, do your pocket and the environment a favor. Buy a Chargie for each and every one of your devices, while stock lasts:

The Chargie Shop

Use the “summer21” coupon for a 5% discount.


How Chargie’s new resin cases are made

Very durable, non-flammable resin case (not plastic)

When you start manufacturing with no experience in manufacturing whatsoever, you have to learn from others and invent. And not be afraid to change the design when it makes sense. You want to make things happen, no matter how bad they might come out at first.

There are some people who might object to this point of view, but that’s the way it happens on so many levels, simply because every little thing you do requires experimentation and money, which all take time. And time is the only resource you have, really. Take a look at Tesla and compare their 2007 product with the newest Model 3 (different scales, I know, but the same phenomenon).

On the other hand, when Chargie started growing, other possibilities came along. Like it’s the case with our new resin printer, the Anycubic Mono X.

About resin printing

Resin printing is the culmination of technology advances in 2021, as far as I can see. The fact that it just became affordable is even more wonderful.

Basically, from bottom to top, you just have an UV lamp, a monochrome 4K LCD screen, a resin recipient with a very transparent bottom and an aluminum platform that goes up 0.05mm at a time with each layer. The 4K LCD opens and shuts its pixels according to the current layer’s image (you can compare this to a CT scanner’s image).

The result is that parts come out at hugely higher speed, since it doesn’t matter if you only do one or if you do 80 pieces at a time, the layer’s exposure time is the same (about 2 seconds).

A messy process that gives birth to the most wonderful creations ordinary makers couldn’t even dream of 5 years ago.

The fun fact is that the parts come out with an outstanding quality. You can extrude text that only has 2mm height, you can do a lot of things you really can’t do with classic FDM printers, with 30 times more speed (only depends on the screen’s size). Your parts don’t bend, don’t melt at 50 degrees Celsius and are not flammable. And you can use a neutral base resin (transparent or opaque white) which you can colour to your liking, and you get translucent or opaque parts. Very neat.

You can read more about the different existing resin printing technologies here

The not to fun fact is that the resin is more expensive than PLA filament, that you have to wash the resulting parts with isopropyl alcohol for 10 minutes, then expose them to sunlight (or a UV lamp) for another couple of minutes on each side, to perform a final curing of the resin. All in all, the entire process is much messier than FDM but again, the resulting pieces’ quality is outstanding.

When things go bad, though, you’ve just lost 80 half-cases and almost half a kilo of resin, which is quite a lot (the one below just happened as I was writing this and the resin from the vat finished, leaving some of the parts incomplete).

Things got bad here. Really bad.

Starting out small

At first, Chargie’s cases were made out of heat-extruded PLA at about 200 oC. If you do it slowly, the parts come out very nicely, but you need to go slooooow. Which is not an option for even small-batch production processes, or you need dozens of printers doing the same thing and eating a huge amount of energy. And you can’t have layer heights of just 0.05mm like you do in resin printing, since the layers are really printed one at a time.

A typical PLA-printed part

The advantage, though, is that you can change your mind whenever you feel like, and you don’t have to spend a fortune on new plastic molds. They DO NOT come cheap (5-figure numbers), and can only be made by specialist engineers, pose very high quality issues when they don’t make them well and you really don’t have any control over their quality until the next batch, thus making the feedback very delayed and so 20th century. On the other hand, 3D-printing, whichever flavour you choose, is very flexible and its quality is all under control, with bearable quirks (I’m talking about FDM, because resin’s quality is already outstanding and can be compared to top-notch plastic casing).

So for a startup in 2021, resin-based 3D printing is the only way out of this issue with the least amount of investment.

A typical resin-printed part

Serving the purpose

For Chargie, which is a device that most of the time sits hidden under a bed, casing quality is not functionally important – it has to be there to give the device mechanical sturdiness, but otherwise I thought FDM printing is a good tradeoff between price and quality.

The visual qualities of a product are, on the other hand, the ones that impress most, and I can say it loud now that I’ve never looked back at PLA printing once I started doing resin.

Chargie is now ready for medium volume production. 2021’s chip crisis is another big hit on production from Lighty Electronics to Tesla and Samsung, but that’s a story for another post.

Right now Chargie’s new case is available to a limited number of orders. Get yours now.

We’re shipping more than just a product

The last hundred of the first thousand Chargie A lot

On November 10, we announced the new Chargie A.

It more or less does the same thing as Chargie Founder Edition, but more accurately and now it also measures the power drawn from your charger and displays it in the app. On top of that, I added functionality that cuts off power below a configurable threshold, or above a certain limit, to protect power surges or short circuits. Of course, your phone and charger also have this, but an extra protection measure is never bad. Android Auto support has also been implemented in hardware, a function waited by so many.

We had a few issues with the PCB assembly factory in China that led to a big delay (about a month) in deliveries. However, that is now history. All of the Chargies have been put into cases (still 3D-printed for now) and now they’ve shipped all over the world to the patient customers who waited dearly.

The effort has been huge – over 18 hours a day of work, answering to emails and making sure everything goes as planned, including finishes to the firmware, app and hardware. We even had to change all of the quartz crystals in every device, because of a human error at one of our parts suppliers.

But here we are. We prioritized UK deliveries because they’re going out of the EU on Jan 1st, and there’s no telling right now of how customs officials will behave after that date. So we packed them in one big parcel on Thursday and shipped them to a trusting partner in London via DHL, who re-shipped individual packs using Royal Mail’s next-day delivery with a tracking number, which means UK customers who preordered up to Dec. 19 will receive them first. I think we will implement this type of shipping with other countries too. Customs formalities are more complicated than with DHL if it’s not an EU country, but it might just work better in the long run. So expect a new, hybrid, piggybacked delivery method that’s faster, cheaper and better than normal post.

Well, not everyone’s experience has been the same. Others wanted to give out Chargies for Christmas, but unfortunately it wasn’t possible. However, this is not the norm and we’ll try to do better next time. I’m sorry for all those ruined plans. Our next stock will be double (we hadn’t expected such a surge in orders) and we will continue to restock well before it’s over.

I’m personally glad that the Chargie idea caught so well and that people are aware of their batteries’ degradation and want to protect what they already own. This is anti-consumerism at its finest.

So yes, we’re shipping more than just a product. We’re shipping parts of our lives, thousands of hours of hard work, sleepless nights, early mornings and the promise to innovate further. Very few people can say they made it to this point – having an actual product that sprung out of their minds, then make it and ship it to real customers, who use it in their real lives.

Thank you for all your patience, trust and involvement in the Chargie project. It means a lot and it fuels its own progress and the other innovative gadgets I have in mind.

Merry Christmas and Happy New Year to all!

Ovidiu Sandru

Why and How a 65% charged phone actually makes sense for most people

We, as a species, have evolved by eventually setting ourselves on top of the entire food chain. Nevertheless, the days of wandering for food with our empty bellies still haunt us genetically and that may be the reason why we sometimes make irrational decisions as to whether we actually need to have our supplies full or not: electric car battery, refrigerator, gas tank, stomach and our phone battery.

The scenario is simple:

  • Joe wakes up. He takes a look at his phone, it’s 7am. Battery is at 75%, because he used Chargie to stop it.
  • Joe eats his breakfast, sips some coffee while browsing through some news and his Facebook feed, maybe some e-mails. Battery goes down to 70%.
  • Joe drives or takes the subway or bus to work, maybe he uses the power-hungry Waze, or scrolls through his Facebook feeds. Battery drops to 50%. At this level, the phone doesn’t get very hot because the internal resistance hasn’t dropped much yet, the battery has about 3.7V (ideal).
  • He places his phone on the wireless charging pad at work. The pad also has a Chargie attached before it, so Joe’s Chargie app on the phone detects that it’s being charged, tests the power line, decides that it’s not the home charger, and looks for the work charger. After blinking the power a few times, it connects and quietly recharges the phone to 65%
  • Joe uses his phone throughout the day, the battery oscillates maybe between 40% and 60%, but is stopped every time it reaches 65. Battery degradation: almost zero.
  • After work, Joe gets back home. Before leaving work, he pumps some more power into the phone by setting Chargie to 70%.
  • So maybe he goes to a bar, maybe he picks up his wife or kids from somewhere, it gets late.
  • Joe goes to sleep at about 11pm. His battery, in its high 30s, is still giving him enough power without having been stressful throughout the day.
  • Cycle repeats. Battery lasts forever without a hitch. Joe only takes it to 100% on occasion, which is by far less damaging than otherwise keeping it there all the time with no practical purpose.

So what’s the catch, you may ask.

Had Joe not used Chargie, the battery would’ve been at 100% or in its high 80s or 90s all day long. After a year, Joe’s battery would’ve started to die on him on long journeys or at times when he’d needed that phone. Joe would’ve been unhappy.

By only taking the charge to 70% or 60% or the lowest usable value for the day, Joe still has enough power in it and he’ll be able to use his phone at full capacity and speed for a much longer time. Should he decide to buy a new phone, the old one would still have a long fight until becoming technologically obsolete.

Joe is happy and so is the planet, because you know, recycling and reusing more are closely linked to lowered pollution levels of all kinds. And Joe’s battery is still at some 95% capacity after 5 years of usage. In a perfectly functioning phone, after an absurd amount of usage.

Bottom line: you don’t need a 100% charged phone if you work in an office where it sits on a charger all day long, anyway.

This practice just degrades your battery and the old 100% is not the same 100% after a while. The battery starts to get hot, the phone runs slower to prevent further damage by overheating, and after a year and a half you end up selling it for nothing or taking it to a repair shop. And buy a new, glorious phone that does about the same stuff the old one did, but faster – mostly because its new battery can still do it.

Happy New Year!

There we go.

It’s exactly a year since I’ve sketched the first Chargie schematic. I can’t believe it went so fast!

Today I’ve compiled version 1.18.06 of the app, the best so far. Now Chargie can do much more than it could back in May when version 1.0.0 came out.

I remember the first customer at Maker Faire Vienna in May – he was a very young dude, saying he’d dreamed about such a device for years – that’s what’s truly fulfilling about inventing and making stuff.

Knowing that your creation will enter people’s homes, will satisfy their needs, that some of them will be actively involved in the very core of your product’s development with their original ideas, is something few people experience in their lifetime.

It’s been an honor knowing you all from around the world. We’ve sold more than 1300 Chargies on every inhabited continent, in most of the countries where there’s a smartphone.

It’s been a good time – with real feedback, as deserved – good or bad.

Let 2020 be a year of progress for this project and let batteries live well for your entire phones’ lives.

Happy New Year!

Your Chargie’s creator,

Ovidiu Sandru

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