EDIT: SCROLL DOWN TO POST #12 WHERE I SHOW YOU HOW TO BUILD YOUR OWN FULL-1900 mAh CHARGER!
http://forum.xda-developers.com/showpost.php?p=43663686&postcount=12
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Has anyone used this particular item before? Or can recommend a similar hard-wire unit that operates at 2A to 3A?
http://www.amazon.com/DROK-Converter-Connectors-Adapter-Recorder/dp/B00D6B6CJI
I'm thinking about getting one for my SUV and Motorcyle to charge the S4 at normal 1900 rates like the OEM wall-charger. Get that FAST charge.
Yes, I know about cig lighter chargers. No, that is not what this thread is for.
hello did you buy it?
CZ Eddie said:
Has anyone used this particular item before? Or can recommend a similar hard-wire unit that operates at 2A to 3A?
http://www.amazon.com/DROK-Converter-Connectors-Adapter-Recorder/dp/B00D6B6CJI
I'm thinking about getting one for my SUV and Motorcyle to charge the S4 at normal 1900 rates like the OEM wall-charger. Get that FAST charge.
Yes, I know about cig lighter chargers. No, that is not what this thread is for.
Click to expand...
Click to collapse
I have this hardwired into my WRX:
http://www.ebay.com/itm/CDL-WaterPr...35?pt=US_Power_Inverters_&hash=item1c34627e83
I ran it off the clock circuit (my clock is dead anyways) but any switched 12v source will do. It charges my car integrated Nexus7 without any issues, and at the faster rate.
I have another powering a servo and an aux USB port, but unfortunately I ran so much wire to get it into the center console by the handbrake it charges at USB rates.
paolopaulpaul said:
hello did you buy it?
Click to expand...
Click to collapse
Not yet.
Caferacer said:
I have this hardwired into my WRX:
http://www.ebay.com/itm/CDL-WaterPr...35?pt=US_Power_Inverters_&hash=item1c34627e83
Click to expand...
Click to collapse
Wow, that's a great price! Does it charge at ~1900 rates? Here is an app that will tell you the charging rate:
https://play.google.com/store/apps/details?id=ccc71.bmw&hl=en
Just bought this one for $9 shipped.
http://www.ebay.com/itm/NEW-waterpr...34?pt=US_Power_Inverters_&hash=item3a7a051922
It's a waterproof box so it'll be better on my Motorcycle. I'll let you guys know how it works out by next week sometime.
There was a thread somewhere that explained why some chargers won't do the 1900mah charge. He figured out where and what size resistors to put across the wires to enable it. I think it was in a car dock thread, I'll try and find it.
Sent from my de-Verizonized Galaxy S4, CleanRom style! (using Tapatalk beta 4)
CZ Eddie said:
Not yet.
Wow, that's a great price! Does it charge at ~1900 rates? Here is an app that will tell you the charging rate:
https://play.google.com/store/apps/details?id=ccc71.bmw&hl=en
Click to expand...
Click to collapse
That app won't show the mA on my N7 but does show it charging near the same % as a fast charger.
MonkeyTime said:
There was a thread somewhere that explained why some chargers won't do the 1900mah charge. He figured out where and what size resistors to put across the wires to enable it. I think it was in a car dock thread, I'll try and find it.
Sent from my de-Verizonized Galaxy S4, CleanRom style! (using Tapatalk beta 4)
Click to expand...
Click to collapse
It's the shorting/grounding of the data pins that activates 'fast charge' mode on some phones. Nexus 7's and my E4GT (Sprint S2) when I used it didn't require the pins to be shorted to charge faster. Mostly it was the charger (duh) and the quality/length of the cable that affected the charge speed. As well, most of the heavy 1A plus chargers short the data pins in the charger itself so you can use any cable. I believe the S4 doesn't require it as well, but don't have any data to confirm it.
The way I wired mine was to sacrifice a USB female port from a USB extender, and attached the power leads and shorted the data leads. Figured it couldn't hurt. The converter doesn't care if it's putting out 500mA or 3A. It's not intelligent like some chargers in what current it doles out.
Caferacer said:
shorted the data leads. Figured it couldn't hurt. The converter doesn't care if it's putting out 500mA or 3A. It's not intelligent like some chargers in what current it doles out.
Click to expand...
Click to collapse
Yours is the second post I've seen where someone has shorted the data pins on a charging-only setup. Is there a reason for doing that?
Ehh, n/m. I remembered the "Google before you ask" mantra...
This explains it nicely:
http://forums.androidcentral.com/samsung-galaxy-s3/194362-wont-charge-over-usb-car.html
MichaelBR said:
There are some reasons why it won't work, and some ways to solve it. First, let's understand how it works:
The USB cable has four pins. The inner two pins are where the data goes through. THe outer, power.
When the USB cable is plugged in to a computer, the data pins are connected normally and the phone knows it can only draw certain amount of power
When the cable is plugged in to a charger, the two middle pins are shorted, and the phone knows that it's NOT going to be sendind/receiving data, so it can draw as much power as it can. That's why it charges faster with the charger than when plugged in to a computer
Most chargers short the two pins. Some cables have a switch to do that.
There are different cable cauges as well, with different power capacities.
Some USB chargers, notably car chargers and some low-end (i.e. not good brand) chargers that don't draw from the car/don't give the phone as much current as it needs.
So, if any of below, the phone won't charge, or won't charge fast enough. Or, worse: it may appear as charging, but actually losing battery charge!
Cable too long or incorrect gauge
Middle pins not shorted for some reason
Charger doesn't deliver enough current
And the solutions are:
Don't use cable extensions, cables that are too long. Stick with the cable that came with the phone or with the charger
Get a good car charger, that delivers the right amount of current
I imagine you just got the cable from your original wall charger and plugged it in to the car charger. If you did that, then chances are the cable is OK, and the charger is the culprit. If this is the case, then get a better charger. Check how much current that charger can deliver. Check how much current your device actually needs.
Hope this helps.
Click to expand...
Click to collapse
CZ Eddie said:
Yours is the second post I've seen where someone has shorted the data pins on a charging-only setup. Is there a reason for doing that?
Ehh, n/m. I remembered the "Google before you ask" mantra...
This explains it nicely:
http://forums.androidcentral.com/samsung-galaxy-s3/194362-wont-charge-over-usb-car.html
Click to expand...
Click to collapse
To be clear, there is no indication it is *required* for the S4. Mine quick charges just fine without shorted data leads. However I did this because my friends have a variety of phones and it only took a few minutes to do.
Caferacer said:
That app won't show the mA on my N7 but does show it charging near the same % as a fast charger.
It's the shorting/grounding of the data pins that activates 'fast charge' mode on some phones. Nexus 7's and my E4GT (Sprint S2) when I used it didn't require the pins to be shorted to charge faster. Mostly it was the charger (duh) and the quality/length of the cable that affected the charge speed. As well, most of the heavy 1A plus chargers short the data pins in the charger itself so you can use any cable. I believe the S4 doesn't require it as well, but don't have any data to confirm it.
The way I wired mine was to sacrifice a USB female port from a USB extender, and attached the power leads and shorted the data leads. Figured it couldn't hurt. The converter doesn't care if it's putting out 500mA or 3A. It's not intelligent like some chargers in what current it doles out.
Click to expand...
Click to collapse
Caferacer said:
To be clear, there is no indication it is *required* for the S4. Mine quick charges just fine without shorted data leads. However I did this because my friends have a variety of phones and it only took a few minutes to do.
Click to expand...
Click to collapse
While I agree with what you posted in general terms, below is the link to the thread I was talking about. He did some testing and found the pins aren't just shorted, but shorted w/ 82K resistors to get the maximum charging current.
http://forum.xda-developers.com/showthread.php?t=2274321
Will it damage the phone to have a 3A charger plugged into it? Also If it does not damage would it be able to run the camera as a "blackbox" and not die? I currently have a 2a charger and when i use the black box software it dies after about an hour or so.
SUCCESS!
I got the little black box in from eBay.
Gave it a quick/test wire setup. This is NOT indicative of the end result which will be soldered & have shrink tubing, etc.
Okay, first I grabbed my stock S3 data/charge cable.
Snipped off the standard USB end.
Cut off the ends of the pin 2 & 3 wires since they were not being used anymore (data pins).
Then attached the red (power) from the S3 cable to the yellow (power) lead from the little black box. And did the same for the black (negative) leads.
Then hard wired the red & black from the little black box to my motorcycle battery terminals.
On the first test, I only got 460mAh.
Then I decided to short the 2 & 3 pin wires (green & white) on the S3 cable together (attach them to each other). This gave me 1120mAh!
Next I took the tin-foil and wire braid from the S3 cable and tied them together with the negative lead on the S3 cable. This gave me 1220mAh!
Still not satisfied, I then cut down the 5' S3 cable and made it a 1.5' cable.
AND THIS RESULTED IN A FULL 1920mAh!!!! Right on.
That is exactly the same mAh as the stock S4 wall charger & cable combo give me. Very stoked about this. So now I'll do a nice clean install on the bike and then duplicate it for my car dock sometime soon. FULL CHARGE AHEAD!
Crxdc said:
Will it damage the phone to have a 3A charger plugged into it?
Click to expand...
Click to collapse
No, it will be fine. The phone only draws 1900mAh. If the phone were drawing 3000mAh then there might be a problem.
All done and installed now. And working great!
Negative battery connection (I forgot to shrink tube it but will do that later).
Braided negative wire (~16 to 18awg?) running under gas tank to front of bike.
I wish I would have waited till I got black zip ties in. I hate white zip ties.
The braided wire at the right side of pic that goes up above the gas tank is the pos/neg wire lead that plus right into the phone.
2A inline fuse connecting via blade connector (sorry MC) to a previously used power-on-ignition wire.
This goes to (+) on the little black box.
Note the shrink tube over the braid over the crimp connector (wire goes to top-right of screen).
Phone sitting next to the phone dock I made out of a holster that came with my phone case.
You can see the braided/shrink tubed MicroUSB connector already plugged into the phone.
It's not showing a charge though, because the ignition key is not turned on.
Phone is inserted into stable dock (it will never fall out unless I crash hard).
Ignition is turned on and battery is charging!
And proof that it's charging at the full 1900mAh. Success!
CZ Eddie said:
All done and installed now. And working great!
Negative battery connection (I forgot to shrink tube it but will do that later).
Braided negative wire (~16 to 18awg?) running under gas tank to front of bike.
I wish I would have waited till I got black zip ties in. I hate white zip ties.
The braided wire at the right side of pic that goes up above the gas tank is the pos/neg wire lead that plus right into the phone.
2A inline fuse connecting via blade connector (sorry MC) to a previously used power-on-ignition wire.
This goes to (+) on the little black box.
Note the shrink tube over the braid over the crimp connector (wire goes to top-right of screen).
Phone sitting next to the phone dock I made out of a holster that came with my phone case.
You can see the braided/shrink tubed MicroUSB connector already plugged into the phone.
It's not showing a charge though, because the ignition key is not turned on.
Phone is inserted into stable dock (it will never fall out unless I crash hard).
Ignition is turned on and battery is charging!
And proof that it's charging at the full 1900mAh. Success!
Click to expand...
Click to collapse
Awesome.
Hard wire phone charger and Bluetooth Receiver to car battery plan...
Hello,
I'm planning to install the following in my car along with new stereo head unit:
1) CraigsDocks Samsung Galaxy S4 docking charger, with USB power out
2) Rocketfish Bluetooth Music Receiver (with aptX), with DC 5V power out (connected to 3' 5V to USB power cable)
Plan to use this to convert (found on EBAY - I can't post links here in XDA yet/new user): Dual USB Cable Connectors Power Adapters 8-22V 12 V to 5V/3A DC Volt Converters... to connect directly to my car battery to power both the Samsung charger and the Rocketfish.
I'm new at this and I'm wondering if you all think this will work, or if I'm missing any steps, or if there are other better suggestions?
Thanks for your help!
ebrowni said:
Hello,
I'm planning to install the following in my car along with new stereo head unit:
1) CraigsDocks Samsung Galaxy S4 docking charger, with USB power out
2) Rocketfish Bluetooth Music Receiver (with aptX), with DC 5V power out (connected to 3' 5V to USB power cable)
Plan to use this to convert (found on EBAY - I can't post links here in XDA yet/new user): Dual USB Cable Connectors Power Adapters 8-22V 12 V to 5V/3A DC Volt Converters... to connect directly to my car battery to power both the Samsung charger and the Rocketfish.
I'm new at this and I'm wondering if you all think this will work, or if I'm missing any steps, or if there are other better suggestions?
Thanks for your help!
Click to expand...
Click to collapse
Looks good to me. :good:
http://www.ebay.com/itm/Dual-USB-Ca...064?pt=LH_DefaultDomain_0&hash=item51af639938
ebrowni said:
Hello,
I'm planning to install the following in my car along with new stereo head unit:
1) CraigsDocks Samsung Galaxy S4 docking charger, with USB power out
2) Rocketfish Bluetooth Music Receiver (with aptX), with DC 5V power out (connected to 3' 5V to USB power cable)
Plan to use this to convert (found on EBAY - I can't post links here in XDA yet/new user): Dual USB Cable Connectors Power Adapters 8-22V 12 V to 5V/3A DC Volt Converters... to connect directly to my car battery to power both the Samsung charger and the Rocketfish.
I'm new at this and I'm wondering if you all think this will work, or if I'm missing any steps, or if there are other better suggestions?
Thanks for your help!
Click to expand...
Click to collapse
Just realize that if you wire it to your batter there will be a small draw from the converter and chargers even when not in use. If you let your car sit for a week or long weekend you might come out to find the battery dead. I personally wouldn't wire anything directly to the battery, especially since you didn't mention an inline fuse. Find a switched 12v lead inside the car. Not only does this protect your phone, charger, and car, but it also means you don't have to run anything through the firewall, which is a pain.
You can either tie into the cig lighter wiring, or find something else (I used my clock circuit since it runs to a 10A fuse and is switched).
Caferacer said:
Just realize that if you wire it to your batter there will be a small draw from the converter and chargers even when not in use. If you let your car sit for a week or long weekend you might come out to find the battery dead. I personally wouldn't wire anything directly to the battery, especially since you didn't mention an inline fuse. Find a switched 12v lead inside the car. Not only does this protect your phone, charger, and car, but it also means you don't have to run anything through the firewall, which is a pain.
You can either tie into the cig lighter wiring, or find something else (I used my clock circuit since it runs to a 10A fuse and is switched).
Click to expand...
Click to collapse
Your clock circuit is switched?
I agree with the firewall being a pita, but I'm not a huge fan of tapping on to other circuits either. With nothing charging, what would be drawing any current? If there's anything, it would have to be minimal. It also allows you to charge a phone/device with the car not running, sometimes very handy (and a modification I've made before for just that reason). An inline fuse is also a must, good point!
Sent from my de-Verizonized Galaxy S4, CleanRom style! (using Tapatalk beta 4)
MonkeyTime said:
Your clock circuit is switched?
I agree with the firewall being a pita, but I'm not a huge fan of tapping on to other circuits either. With nothing charging, what would be drawing any current? If there's anything, it would have to be minimal. It also allows you to charge a phone/device with the car not running, sometimes very handy (and a modification I've made before for just that reason). An inline fuse is also a must, good point!
Sent from my de-Verizonized Galaxy S4, CleanRom style! (using Tapatalk beta 4)
Click to expand...
Click to collapse
Yes, my clock circuit has a switched lead to wake up the clock as well as a hard wired lead to retain the time. Both run to the same 10A fuse.
There is a small transformer in the converter and the receiver bluetooth will stay on. They have a small energy draw which is not negligible over a long period of time. At the very least I would include a dash mounted switch to completely shut the charger and receiver off. For instance I have a bluetooth OBD adapter (Not too much unlike your bluetooth receiver) that drained a 2 year old car battery over a week I left the car sitting while I was on vacation. For day to day driving it's not a problem but my OBD adapter isn't hardwired and I can just remove it when I know the car will be sitting.
Thanks
Caferacer said:
Just realize that if you wire it to your batter there will be a small draw from the converter and chargers even when not in use. If you let your car sit for a week or long weekend you might come out to find the battery dead.
Click to expand...
Click to collapse
Oooh, good point! Makes sense to me. I have never done a mod to my car's audio system so I'll be paying a professional installer. I'm so glad to have this information before I shop around at the good places here and get some offers!
Thank you!
I see there are posts case , charger and etc, but no post about cable, including charging cable, data cable, OTG cable.
Which cable is the best you find?
For charging, the original charger with fast charging from Samsung. You can also get it the fast charging car adapter.
Wall charger http://www.amazon.com/Samsung-Adaptive-Fast-Charger-Wall/dp/B00OM40K1Y/ref=sr_1_2?s=wireless&ie=UTF8&qid=1439985282&sr=1-2&keywords=samsung+fast+charger
Car Charger http://www.amazon.com/Samsung-Charger-Galaxy-Note-Edge/dp/B00WZXVOBY/ref=sr_1_4?s=wireless&ie=UTF8&qid=1439985282&sr=1-4&keywords=samsung+fast+charger
Dghan said:
I see there are posts case , charger and etc, but no post about cable, including charging cable, data cable, OTG cable.
Which cable is the best you find?
Click to expand...
Click to collapse
Go for original charger for fast charging. No alternative of it i think.
hiteshonline said:
Go for original charger for fast charging. No alternative of it i think.
Click to expand...
Click to collapse
No, there're ton of alternative. Many cables that I already have work fine with QC 2.0.
I don't mean to butt in but I see this topic is about charging cables and was wondering what is a good thick charging cable that would last a long time. It seems all the cables i had the ends that plug into the phone would stop working like either it would not stay plug in or just won't charge anymore and the cable it's self would start to come apart from bending over time.
Ya i dont think the op was asking about actual cargers but the cable itself. I got this same charger off ebay and the cable is great. The little led lights up as soon as u touch the actual micro usb section so u can see to plug it in in the dark. It only lights up when u are touching it with your hands. Cable is nice and long and seems to be holding up great.
http://pages.ebay.com/link/?nav=item.view&id=400809387047&alt=web
Sent from my SM-G920P using XDA Free mobile app
Droidmodderx just reviewed a great aftermarket cable that would work fine with our phone on YouTube it's a hybrid cable that plugs into a phone either way no more needing to check which way is up anymore and it's non tangle durable material. Just search that name on YouTube and watch his review
https://youtu.be/x4bHKpa-3QA here's that sweet after market cable review. Definitely buying this if one of my cords takes a dump
I used to think all USB cables were the same and paying more for one was a waste of money. But I was so wrong. A quality cable gives faster charging and better data performance alongside a more durable construction.
I use and recommend Volutz branded cables. They aren't actually that much more expensive and buying a 'pack' of them off Amazon worked out exceptional value. I have had no issues on the S6 Edge+ with them at all
.
Sent from my SM-T805 using Tapatalk
shadowm891 said:
I don't mean to butt in but I see this topic is about charging cables and was wondering what is a good thick charging cable that would last a long time. It seems all the cables i had the ends that plug into the phone would stop working like either it would not stay plug in or just won't charge anymore and the cable it's self would start to come apart from bending over time.
Click to expand...
Click to collapse
I got a 3-pack Ace Teah reversible cable from Amazon. It works fine for me.
What's more, it is 3 pack with 6.6ft great length and only cost me $11.99! Recommended!
First of all I would like to thank Meenova for being as kind as to send me out some items to test out, and I would also like to take this opportunity to say this is not sponsored.
The first item Meenova sent me out was a USB Charge Current & Voltage Meter. In all honesty, I don't actually know how to use one of these. The product they sent out appears to do its job of viewing the current and voltage running through it, and it seems rather well built and very sturdy. If you know how to use one and are interested in one you can find one here.
The next item I was sent was a USB 2.0 Hub with Micro USB Charging Ports. Again, it is a really well built product and very sturdy. One of the best features of this product is the two micro USB ports on each side of the hub, if you have products what are able to sit on these hubs (like the Z5 can) you can use the device as a charging stand. Another wonderful feature of this device is that it has 2 USB type A charging ports on it, so it effectively adds another USB port to your computer (if you use it for this function). All 4 of the ports/hubs on the device charge devices what are connected to them too, so it is handy for charging 4 devices at once if you need to. It is a nice and compact product (roughly 2cm x 4.5cm x 0.75cm) so it really doesn't take up much space on the desk. The device also has a little LED on the side of it what allows for the user to see if and when the unit is receiving power (good for troubleshooting faulty computer USB ports and Mains charging adapters). If you are interested in picking one of these devices up for yourself you can find one here.
The next item, which is one of my favourite accessories I've ever used, is the Smart & Secure Fast Charging Adapter. This little piece of kit can also be referred to as a "USB Condom". The basis of this device is to act as a barrier between your (or any) computer and block any data transfer and only allowing charging. The device does it job wonderfully, especially if you use a USB cable to charge your phone on external computers (like employers or school computers), I haven't had any problems with any cables connecting to it, and it functions really well for charging a PS4 controller and not having the PC detect input from it (via DS4Windows). Also I have not noticed any drop in USB charging speeds while using this little piece of kit while using my Aukey QC 2.0 charging cable. The size of the device is really nice too as it is about the size of a USB memory drive and comes with a nice little rubber case to attach it to your keys. If you are interested in one of these (especially to stop people snooping on your personal files while charging) you can pick one up from here.
The final item I received was a Smart & secure Fast Charging Micro USB Cable. Again, such a wonderful piece of kit and it does its job extremely well. It has 2 main functions, the first is regular charging and data synchronization, and the second is only charging. The latter is achieved by having the functions of the previous product embedded into the side of the cable which plugs into the computer and you can switch between the two functions using a switch (also embedded into the side of the cable what plugs into the computer). There is also a little LED on the cable to indicate which function is active, green indicates that the secure charging only mode is active, while red indicates that the charging and data sync is active. Again, I have noticed no drops in charging speed whilst using this piece of kit, nor have I noticed any drops in speeds of data transfer. The length of the device is 1 meter (3.3 feet). The cable is covered with Nylon fabric to help prevent the cable tangling, and it appears to do this really well by kinking the cable so it can be pulled out really easily. If you are interested in one of these you can pick one up from here.
The customer support from Meenova is absolutely wonderful and they are really polite and helpful, one of the best support teams I've had to deal with. All in all I am extremely happy with the products they have supplied and would definitely recommend them.
So having had to get used to batteries that don't last long and soul crushing battery anxiety I've gotten into the habit of always having a battery pack with me. I am looking for a good one for my p4xl (hopefully arriving tomorrow).
What I'm looking for:
Thin while still having around 10000mamph
Same or slightly smaller footprint than the handset in a case.
As fast as possible charging
What I'd like but not deal-breakers:
Fast charging (or as fast as possible)
Usb output port in the middle so I can use as short a cable as possible.
Usually connect the two with command strips and have a finger clip so don't think wireless will work.
I have the AUKEY Power Delivery Power Bank 20000mAh, USB C Portable Charger with 18W PD and Quick Charge 3.0 Battery Pack and its about the size of the XL...
ajpettit said:
So having had to get used to batteries that don't last long and soul crushing battery anxiety I've gotten into the habit of always having a battery pack with me. I am looking for a good one for my p4xl (hopefully arriving tomorrow).
What I'm looking for:
Thin while still having around 10000mamph
Same or slightly smaller footprint than the handset in a case.
As fast as possible charging
What I'd like but not deal-breakers:
Fast charging (or as fast as possible)
Usb output port in the middle so I can use as short a cable as possible.
Usually connect the two with command strips and have a finger clip so don't think wireless will work.
Click to expand...
Click to collapse
I bought this back in August, when they had a coupon knocking the price down to $11.
https://smile.amazon.com/gp/product/B07LB1JQJW/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
It's TINY, it offers 5000 mAH (which is enough for me), and supports USB C power delivery for fast charging. You can also charge the battery pack via USB C, which is great; I do not use anything that relies on a micro-USB any more. Plus, my wife can use the old-school USB port on the back to top off her iPhone.
Seidio had several listed for the P4s as well. Including a few that also offer wireless charging.
Sadly, the 10kmAh with a flashlight does wireless but only at 5W, not the full 10W the P4s can handle. But they may have another one that offers full 10W wireless charging. I asked by the contact page and received an email stating so, but it is unclear if they are referring to simply a wireless charger, or another of their power Banks:
”Thank you for contacting Seidio Online. Pixel 4XL is using Qi Fast Wireless Charging and our 10W wireless fast charger will support it. However, the 10,000mAh Wireless Charging Vault only support a regular 5W wireless charging.
Let us know if you have any other questions.”
All of these power Banks also allow direct USB-C charging as well.
https://www.seidioonline.com/shop/?device=pixel-4-xl&style=
Sent from my Pixel 4 XL using Tapatalk
https://shop.aukey.com/collections/...rging-power-bank-with-18w-pd-ouput-and-qc-3-0
Looks promising