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4.8A 24W Dual USB Car Charger Volt Meter Car Battery Monitor with LED Voltage & Amps Display, Cigarette Lighter Adapter, Compatible with iPhone 15 Pro Max Plus 14 Samsung Galaxy S24 iPad Pro
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Purchase options and add-ons
Brand | JEBSENS |
Connectivity Technology | USB |
Connector Type | USB Type C |
Compatible Devices | Samsung Galaxy, Tablets, Google Pixel, Cellular Phones, IPhone, IPhone 14 Pro max/14 Pro/14 Plus/14/IPhone 13/13 Mini/13 Pro/13 Pro Max/12/12 Mini/12 Pro/12 Pro Max/11/Pro/Max/iPhone X/XS/XR/8/8 Plus/SE, Smartphones, Pixel 6 Pro/6/3XL/3a/2/1/XL,Nexus 6P/5X/9, LG G6/G5/G4/G3/V20, HTC 10, HTC One A9/M9, BLU G9 Pro, Motorola One Zoom Droid RAZR MAXX, Blackberry Nexus 5X/ 6P, Nexus 5X/ 6P/Huawei Mate 9/ Mate 10/ P10/ P20/ P20 Pro/ Mate RS Xiaomi MI 6/ MIX 2/ MIX 2S Nokia 7/7 Plus/Nokia 8, Tablets, Driving recorder, Navigator, Samsung Galaxy s22/s21/S10/S9/S8/S7/S6/Plus/Note 20 Ultra/10/10+/9/8/7/6/Edge/S6 Edge/S6 Edge+ and more, IPhone 15/ 15 Pro/ 15 Pro Max/ 15 Plus/ 14/14 Pro/ 14 Pro Max/13/ 13 Pro/ 13 Pro Max/ 12/ 12 Pro/ 12 Pro See more |
Compatible Phone Models | iPhone Xs Max, iPhone Xs, iPhone Xr, iPhone x, iPhone 8, iPhone 8 plus, iPhone 7, iPhone 7 plus, iPhone 6, iPhone 6s, iPhone 6 plus, iPhone 5, iPhone 5s, galaxy s10, galaxy s10 plus, galaxy s9, galaxy s9 plus, galaxy s8, galaxy s8+, galaxy s7,galaxy s7 edge,galaxy s6,galaxy s6 edge,galaxy s6 edge plus,galaxy s5,galaxy s4,galaxy s5 mini,galaxy s5 active,galaxy s3,galaxy note 8,galaxy note 5,galaxy note 4,galaxy note 3,galaxy note 2, Macbook Pro,Macbook Air,Macbook 12-inch,iPad Pro,iPad Air, iPad Mini, Google Pixel,Pixel xl, pixel 2,pixel 2 xl,Nexus 6,Nexus 5X, Nexus 6P,Chromebook,Motorola Droid Turbo, Moto X 2014,Moto Z, Moto Z Force, Moto g6, LG G6, LG G5 G4, LG G Flex2, LG V10, LG V20 v30,LG GPad,Sony Xperia Z4 / Z4 Tablet, Z3 / Z3 Compact / Z3 Tablet Compact, HTC 10, HTC one A9, HTC One M9 / M8, HTC Desire Eye, HTC One remix,OnePlus 5 / 3 / 3T, Huawei Honor 8,Window Phone, Bluetooth Speaker / Headphones; Kindle; GPS, Samsung Galaxy, Tablets, Google Pixel, Cellular Phones, IPhone, IPhone 14 Pro max/14 Pro/14 Plus/14/IPhone 13/13 Mini/13 Pro/13 Pro Max/12/12 Mini/12 Pro/12 Pro Max/11/Pro/Max/iPhone X/XS/XR/8/8 Plus/SE, Smartphones, Pixel 6 Pro/6/3XL/3a/2/1/XL,Nexus 6P/5X/9, LG G6/G5/G4/G3/V20, HTC 10, HTC One A9/M9, BLU G9 Pro, Motorola One Zoom Droid RAZR MAXX, Blackberry Nexus 5X/ 6P, Nexus 5X/ 6P/Huawei Mate 9/ Mate 10/ P10/ P20/ P20 Pro/ Mate RS Xiaomi MI 6/ MIX 2/ MIX 2S Nokia 7/7 Plus/Nokia 8, Tablets, Driving recorder, Navigator, Samsung Galaxy s22/s21/S10/S9/S8/S7/S6/Plus/Note 20 Ultra/10/10+/9/8/7/6/Edge/S6 Edge/S6 Edge+ and more, iPhone 15/ 15 Pro/ 15 Pro Max/ 15 Plus/ 14/14 Pro/ 14 Pro Max/13/ 13 Pro/ 13 Pro Max/ 12/ 12 Pro/ 12 Pro See more |
Included Components | charging cable |
Cable Length | 75 Millimeters |
Special Feature | charging_indicator, fast_charging, Fast Charging |
Color | Blue LED |
Input Voltage | 24 Volts |
About this item
- HIGH PERFORMANCE DUAL USB CHARGING PORTS - 24W / 4.8A USB Car Charger charges your favorite mobile devices Compatible for iPad (max speed), iPhone XS, XR, 8 Plus (max speed), HTC, Galaxy, MP3 Players, Digital Cameras, PDAs, Mobile Phones.
- REAL-TIME MONITORING - Concise LED screen displays vehicle’s operating voltage (12V/24V) or the total USB charging output (5V/4.8A Max) in real time, fully controlling the whole charging process. The LEDs are bright enough to read the display without being a distraction while driving.
- SAFE ON THE GO - Intelligent circuit design protects against short circuiting, over-heating, over-currents, and over-charging. Charging stops when battery is full.
- COMPACT DESIGN - One of the industry's smallest USB car chargers for added portability, featuring two USB ports and an LED Display make it easy to access after dark. Input: 12-24V; Output: DC 5V 4.8A or 24W (Shared by two ports). One Year Warranty.
- 12 MONTHS WARRANTY - Comes with 30 days Money Back Guarantee and 12-Months Hassle-free Replacement Warranty.
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This Item Jebsens 4.8A 24W Dual USB Car Charger Volt Meter Car Battery Monitor with LED Voltage & Amps Display, Cigarette Lighter Adapter, Compatible with iPhone 15 Pro Max Plus 14 Samsung Galaxy S24 iPad Pro | Recommendations | dummy | dummy | dummy | dummy | |
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Price | $11.98$11.98 | $16.99$16.99 | -17% $9.99$9.99 Typical: $11.99 | $8.99$8.99 | $16.98$16.98 | $9.98$9.98 |
Delivery | Get it as soon as Tuesday, Apr 2 | Get it as soon as Tuesday, Apr 2 | Get it as soon as Tuesday, Apr 2 | Get it as soon as Tuesday, Apr 2 | Get it as soon as Tuesday, Apr 2 | Get it as soon as Tuesday, Apr 2 |
Customer Ratings | ||||||
Quality of material | 4.7 | 4.8 | 4.1 | 4.5 | 4.8 | — |
Value for money | 4.6 | 4.8 | 3.8 | — | 4.5 | 4.3 |
Accuracy | 4.5 | 4.6 | — | — | 4.6 | 3.6 |
Charging power | — | 4.6 | 4.0 | 4.8 | 4.7 | — |
Durability | 4.8 | — | 4.0 | — | 4.8 | — |
Sold By | BLS LED | Alivation | B King | GemCoo-US | BLS LED | Alivation |
connector type | USB Type C | USB Type C | Dual Type C 45W Port | USB | USB Type A | USB |
number of usb ports | 2 | 2 | 2 | 4 | 2 | 2 |
compatible devices | IPhone 15/ 15 Pro/ 15 Pro Max/ 15 Plus/ 14/14 Pro/ 14 Pro Max/13/ 13 Pro/ 13 Pro Max/ 12/ 12 Pro/ 12 Pro, Samsung Galaxy, Tablets, Google Pixel, Cellular Phones, IPhone, IPhone 14 Pro max/14 Pro/14 Plus/14/IPhone 13/13 Mini/13 Pro/13 Pro Max/12/12 Mini/12 Pro/12 Pro Max/11/Pro/Max/iPhone X/XS/XR/8/8 Plus/SE, Smartphones, Pixel 6 Pro/6/3XL/3a/2/1/XL,Nexus 6P/5X/9, LG G6/G5/G4/G3/V20, HTC 10, HTC One A9/M9, BLU G9 Pro, Motorola One Zoom Droid RAZR MAXX, Blackberry Nexus 5X/ 6P, Nexus 5X/ 6P/Huawei Mate 9/ Mate 10/ P10/ P20/ P20 Pro/ Mate RS Xiaomi MI 6/ MIX 2/ MIX 2S Nokia 7/7 Plus/Nokia 8, Tablets, Driving recorder, Navigator, Samsung Galaxy s22/s21/S10/S9/S8/S7/S6/Plus/Note 20 Ultra/10/10+/9/8/7/6/Edge/S6 Edge/S6 Edge+ and more | Cellular Phones | IPhone 15/15 Pro/15 Pro Max/14/14 Plus/14 Pro Max/13/13 Mini/13 Pro/13 Pro Max/12/12 Mini/12 Pro/12 Pro Max Pixel 3XL/3a/2/1/XL,Nexus 6P/5X/9, LG G6/G5/G4/G3/V20,Samsung Galaxy S24/S23/S22/S10/S9/S8/S7/S6/Plus/Note 20 Ultra/10/10+/9/8/7/6/Edge/S6 Edge/S6 Edge+ | Tablets, Smartphones | PC, Tablets, iPhone | Smartwatches, Smartphones, Cameras, MP3 Players, Tablets |
input voltage | 24 volts | 24 volts | 12 volts of direct current | 12 volts | 0.1 volts | 24 volts |
connector gender | Male-to-Male | Male-to-Male | Male-to-Male | Male-to-Male | Male-to-Male | Male-to-Male |
power source | Cigarette Lighter Socket | Battery Powered | Battery Powered | Battery Powered | Cigarette Lighter Socket | Battery Powered |
From the brand
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LED car charger is one of our most popular products. It has been well received and favored by numerous customers for its high-quality quality materials and durable performance since 2013!
Nobody wants to suffer a breakdown on the road, however, most drivers are indifferent to or unaware of the condition of their car. If you want one of the easiest and most effective ways to ensure your car's health, then you need a battery voltage monitor!
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Product Description
Nobody wants to suffer a breakdown on the road, however, most drivers are indifferent to or unaware of the condition of their car. If you want one of the easiest and most effective ways to ensure your car's health, then you need a battery voltage monitor!
Technology Makes Life Better!
LED car charger is one of our most popular products. It has been well received and favored by numerous customers for its high quality materials and durable performance since 2013!
Jebsens 4.8A USB Car Charger
The 4.8A 24W Dual USB Car Charger for Phones, Tablets and more
- Material: PC+ABS
- Color: Black
- Voltage Measuring Range: 8V-30V
- Current Measuring Range: 0A-4.8A
- Input Voltage: DC 12V-24V
- Output Voltage: DC 5V
- Output Current: 4.8A(2.4A+2.4A)
- Conversion Rate: 95%
- Size: 2.95 x 1.46 x 1.46 in
- LED digital to monitor the voltage and Amps.
- Dual USB Ports pumps out 24W of power charge up to 4.8 amps or 2.4 amps per port.
- One of the industry's smallest USB car chargers for added portability.
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Voltage MonitorThe safety range is 12V to 15V. If it is blow 12V, please replace the battery. |
Overcharge / Overheat ProtectionThe device auto powers off when input/output is higher than safety current. This ensures your devices protected against over-current and over-charging, safe charging while driving. |
Universal CompabilityAlmost all the kinds of the mobile device, such as iPhone 7, 7 Plus, 6S, iPad Air, Air 2, Mini 4, 6s, Samsung S6, S6 Edge,Nexus, HTC, LG, SONY, Motorola and others. |
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LED DISPLAYThe LEDs are bright enough to read the display without being a distraction while driving. |
Monitor Voltage & AmpsMonitor the voltage of the vehicle's car battery when not charging any devices. When charging a device, it cycles between device's charging current, and the voltage of the vehicle's car battery. |
Car ModelThis LED car charger is widely compatible with all the model of car. |
USB C Car Charger | Amazon's Choice | Magnetic Phone Car Mount | 4.8A Car Charger | |
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Customer Reviews |
4.7 out of 5 stars
2,072
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4.6 out of 5 stars
695
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4.2 out of 5 stars
772
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4.7 out of 5 stars
2,072
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Charging Ports | USB C + USB A | USB A + USB A | USB A + USB A | |
Main Feature | Input: 12 to 24 V | Voltage Measuring Range: 8V-30V Current Measuring Range: 0A-4.8A | 6 pcs Strong Magnet One-hand Operated 360° rotation | Voltage Measuring Range: 8V-30V Current Measuring Range: 0A-4.8A |
Maximum Output | USB-C: 4.5V/5A 5V/ 4.5A 9V/3A 12V/ 2.5A 15V/2A 20V/ 1.5A USB-A: 4.5/V5A 5V/ 4.5A 9V/3A 12V/2.5A 20V/ 1.5A | Input Voltage: DC 12V-24V Output Voltage: DC 5V Output Current: 4.8A(2.4A+2.4A) | Input Voltage: DC 12V-24V Output Voltage: DC 5V Output Current: 4.8A(2.4A+2.4A) | |
Color | Black+ Blue LED | Black+ Red LED | Black | Black+ Blue LED |
Material | Acrylonitrile Butadiene Styrene | Acrylonitrile Butadiene Styrene | Heavy Duty Metal | Acrylonitrile Butadiene Styrene |
Size | 2.95 x 1.46 x 1.46 in | 2.95 x 1.46 x 1.46 in | 1.77 x 1.57 x 1.42 in | 2.95 x 1.46 x 1.46 in |
Compatible with | Most Smartphones | Most Smartphones | Most Smartphones | Most Smartphones |
Fast Charge | ✓ | |||
Show Charging Current | ✓ | ✓ |
What's in the box
Looking for specific info?
Product information
Package Dimensions | 4.45 x 2.2 x 1.42 inches |
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Item Weight | 1.44 ounces |
ASIN | B01N00I4TM |
Item model number | KMD01 |
Customer Reviews |
4.6 out of 5 stars |
Best Sellers Rank | #12,403 in Cell Phones & Accessories (See Top 100 in Cell Phones & Accessories) #324 in Cell Phone Automobile Chargers |
Is Discontinued By Manufacturer | No |
Date First Available | December 2, 2016 |
Manufacturer | JEBSENS |
Country of Origin | China |
Warranty & Support
Feedback
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the quality, battery health and readability of the charging adapter. For example, they mention it works great, has two USB-A ports and an accurate readout of your vehicle's voltage. That said, they appreciate the bright display and the accuracy of the readings. That being said, opinions are mixed on charging and display.
AI-generated from the text of customer reviews
Customers like the quality of the charging adapter. They say it works as it should, is excellent, and performs well. Some mention that the unit seems to be good and shows their alternator is working. Overall, customers are satisfied with the product's quality and functionality.
"...However, although I was tremendously pleased with its charging performance and system voltage display capability, the light intensity of the blue..." Read more
"Unit seems to be good, with a few quirks. As others mentioned, color at night is pleasing, a little hard to read during the day...." Read more
"Liked everything, bright display, large enuf for US old farts !" Read more
"...car battery voltmeter, and two USB charging slots, is a handy and well-made gadget...." Read more
Customers find the charging adapter to be a great tool for monitoring battery health. They say it provides an accurate readout of their vehicle's voltage. Customers also say it's easy to monitor battery voltage at a glance and is great for quick diagnosing checking battery voltage. They also say the adapter shows both voltage and current drain rate to help estimate when charge is required.
"...It also displays the charging rate for any device to which you have it connected to quickly let you know that status...." Read more
"...The voltage display is fine and appears to be accurate, but in reality this one is useless as a charger for my devices...." Read more
"Love this. It is easy to monitor voltage in battery at a glance. The usb ports are handy also." Read more
"Great tool to keep an eye on your vehicle charging system. Not to mention you can charge stuff too" Read more
Customers like the readability of the charging adapter. For example, they say the display is easily readable, has bright color, and is not obstructed by the cables. Some mention that the blue LED display is easy to see, however, it washes out slightly in bright sunlight. Overall, most are satisfied with the readout of the battery voltage.
"...tremendously pleased with its charging performance and system voltage display capability, the light intensity of the blue display was incredibly weak..." Read more
"Works just as presented. Display is just right for driving around." Read more
"...They are convenient, easy to read at a glance, and certainly adequate to alert me to important changes in charging voltage that might occur as I..." Read more
"...As others mentioned, color at night is pleasing, a little hard to read during the day...." Read more
Customers like the accuracy of the charging adapter. They mention that it's highly accurate, and the readings are close enough. They also appreciate the reliable meter, and say that it confirms car voltages.
"...The current readings were more reasonable (within 10% of input power assuming 5V output) at lower charge rates...." Read more
"I really like that this has both voltage and current because then you can see how your phone battery, if that’s what you’re charging, is using power...." Read more
"...The Jebsens Volt Meter LED display is a dark blue, and the small volt meter gets hidden under the car dashboard, with both things making it hard to..." Read more
"...The voltage display is fine and appears to be accurate, but in reality this one is useless as a charger for my devices...." Read more
Customers appreciate the value of the charging adapter. They say it works well, is high quality, and has great features.
"...you'll get GREAT performance from a GREAT, responsive Seller, at a GREAT price when considering its capabilities... especially keeping high-draw..." Read more
"...my research found .... this unit is excellent... 2ed best value for money... accuracy within .05 volt of my Fluke $400. multimeter. ......" Read more
"...Great value and good product!" Read more
"...Bottom line: This is a terrific product at a reasonable price. Highly recommended." Read more
Customers like the USB ports on the charging adapter. They say the 2 outlets are great for charging two phones at the same time. The ports are handy and come in handy. Some like that the ports are on the bottom instead of the top.
"...in my car and noticed that it was barely warm, so its power conversion is quite efficient...." Read more
"...So, considering they provide two USB charging ports as well, for my purpose they were worth buying...." Read more
"...It is easy to monitor voltage in battery at a glance. The usb ports are handy also." Read more
"...Overall, im happy with this, charge ports work very well" Read more
Customers are mixed about the charging of the adapter. Some mention that it charges their phone quickly and provides the needed voltage readout, while others say that it has a problem and the battery gauge shows it's charging low. Some say that the adaptor is accurate and provides ample charging power to two cell phones simultaneously, while other say that they noticed the battery voltage creeping lower than 12 volts during these cycles.
"...It's a quick, easy way to monitor the most critical aspects of your car's electrical system...." Read more
"...days at full display brightness, other chargers I have used could not keep it charged...." Read more
"...It fits securely into my 12-v outlets and provides ample charging power to two cell phones simultaneously. Works very well in the car...." Read more
"Charges my phone quickly and provides the needed voltage readout since my truck didn't come with a voltage gauge." Read more
Customers are mixed about the display of the charging adapter. Some mention that it's a nice bright LED display that's easy on the eyes, while others say that it can be hard to view on a sunny day. The display needs to be brighter and is difficult to read in daylight.
"...In addition, it also provides a digital LED display accurately showing the aircraft's charging system voltage, which is a real plus considering the..." Read more
"...The Jebsens Volt Meter LED display is a dark blue, and the small volt meter gets hidden under the car dashboard, with both things making it hard to..." Read more
"Liked everything, bright display, large enuf for US old farts !" Read more
"Too dim in bright light" Read more
Reviews with images
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Top reviews
Top reviews from the United States
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Well, the Jebsens charger was absolutely up to the task, never allowing the battery in my iPad Pro to drop below about 95%, usually keeping it at 100%. When flying with another pilot friend, it also kept his iPad just as fully charged at the same time as mine... FANTASTIC!!! In addition, it also provides a digital LED display accurately showing the aircraft's charging system voltage, which is a real plus considering the rather poor performance of the analog gauges on most legacy general aviation aircraft. I know that it is accurate because I checked it against two other very high quality voltmeters from different electrical test equipment manufacturers whose displays always agree to within hundredth of a volt, and the Jebsens unit was never off by more than .1 volts from the other two. It also displays the charging rate for any device to which you have it connected to quickly let you know that status.
However, although I was tremendously pleased with its charging performance and system voltage display capability, the light intensity of the blue display was incredibly weak, making that display virtually unreadable in any daylight. I hoped it was just a fluke, and that I simply got a unit with an abnormally weak display. I contacted Jebsens about the problem, asking if what I was experiencing was normal and, if not, could I possibly exchange it for another unit. I also asked that, If the weak display was normal, could I exchange the blue display unit for a unit with the red-orange display, hoping that it would be brighter.
They responded very quickly, basically telling me that the blue display was weaker, and that they would definitely send me a replacement unit with the red-orange display at no cost, and that I could just keep the original unit as well. What GREAT customer service!!!
When I got the replacement unit with the red-orange display, I found that it performed just as well as the blue display unit, but that the intensity of the display seemed about three times as bright as the blue unit. In extremely bright sunlight it is still a wee bit of a challenge to read it, but it is more than acceptable.
I have been SO happy with the replacement red-orange display unit that I just bought another one to give to my pilot buddy who had used mine along with me previously. I am also using the original blue unit in my Toyota 4Runner that is my off-roading, trailer towing, vacation vehicle. With its heavily tinted windows, the blue display unit is at least usable.
So, if you intend to use one of these chargers during the day, I would STRONGLY RECOMMEND buying the red-orange display unit. However, no matter which one you choose, you'll get GREAT performance from a GREAT, responsive Seller, at a GREAT price when considering its capabilities... especially keeping high-draw electronics very well charged in your aircraft, boat, or road or off-road vehicle.
Comments:
At first I was surprised that my vehicles were reporting voltages as high as they were (old Toyota at 15.5V at 3000 RPM). With high voltages like this, the unit switches readings faster between amps and volts. Even a modern car was at 14.4V. Not out of spec but I expected more like 13.8.
Test results:
I started off at lower voltage to see what it would do. My test rig is pictured. Note that supply wires were not large, and I think I was getting some voltage drop even at lower current like 1A. Note that I did not measure output current, I only measured input volts and current, but the output cannot exceed the input V*A.
At low supply voltages like 10V, the unit would turn on, try to supply current, run out of supply, and turn off current. This raises voltage again, and it tries again. Not unexpected at all.
At 11.7V, these effects went away and the unit could supply a steady reported 2.73A (on the output side) to my 2 devices. Your car would be off and battery depleted at that point, so that is a good result.
Some mentioned varying voltage readings and it measured that way too. The USB devices (phone, etc) control their own charge rate. They seem to be attempting to draw a ton of amps, this lowers the output voltage (guess, not measured), and the load devices then reduce their demand to bring the output voltage back up. Once back up, the units attempt to draw more, and the cycle repeats, with less than perfect feedback controlling it to a non-steady state, which is why you see some cycling in volts and amps. This is probably normal but I would think the devices would learn an optimum draw rate and attempt to hold that.
The voltage was right on, whatever the display said was within 0.1V of true input voltage measured at the terminals, but it did vary by ± 0.3V or so as the cycling was happening. I think with larger wires on the input side I would have seen less of this.
With 2 units being charged and both screens on, the max input power was 13.3W (14VDC at 0.95A). The charger reported 3.63A on the output side at that setting. 3.63*5V = 18.1W, which is definitely not happening (output power cannot be more than input power). So either the amp reading is correct, but the output was drawn down to 3.7V as more time is spent with the gate wide open to the battery (most likely), or the output voltage is really 5V and the current is overstated. I didn't attempt to connect to the output side, so I don't know which is correct. The current readings were more reasonable (within 10% of input power assuming 5V output) at lower charge rates. I ran the unit for hours in my car and noticed that it was barely warm, so its power conversion is quite efficient.
USB charging can be pretty involved with few standards, so without more measurements, it's hard to say whether the current is correct, but it definitely followed the loads I was giving it.
The charger was not enough to keep up with my Galaxy Tab S, but almost. It will drop maybe 10% during a long trip in bright sun with bright screen, even with big cables. But this is no different than my Anker charger, which I consider to be excellent. So the unit supplies at least as much as the Anker which is rated at 4.8A total, and it is a beast, so I suspect the charge circuitry on the tablet is just not up to the task of keeping the battery at 100% in bright sun with the screen on 100%, no matter what charger is used (the Anker and the Jebsens have done the best I have seen). Adding a phone to the mix made no difference to that result, so it is not a power supply problem.
Overall, a good unit. Please comment if you measure and compare the output current.
Reviewed in the United States on October 1, 2018
Comments:
At first I was surprised that my vehicles were reporting voltages as high as they were (old Toyota at 15.5V at 3000 RPM). With high voltages like this, the unit switches readings faster between amps and volts. Even a modern car was at 14.4V. Not out of spec but I expected more like 13.8.
Test results:
I started off at lower voltage to see what it would do. My test rig is pictured. Note that supply wires were not large, and I think I was getting some voltage drop even at lower current like 1A. Note that I did not measure output current, I only measured input volts and current, but the output cannot exceed the input V*A.
At low supply voltages like 10V, the unit would turn on, try to supply current, run out of supply, and turn off current. This raises voltage again, and it tries again. Not unexpected at all.
At 11.7V, these effects went away and the unit could supply a steady reported 2.73A (on the output side) to my 2 devices. Your car would be off and battery depleted at that point, so that is a good result.
Some mentioned varying voltage readings and it measured that way too. The USB devices (phone, etc) control their own charge rate. They seem to be attempting to draw a ton of amps, this lowers the output voltage (guess, not measured), and the load devices then reduce their demand to bring the output voltage back up. Once back up, the units attempt to draw more, and the cycle repeats, with less than perfect feedback controlling it to a non-steady state, which is why you see some cycling in volts and amps. This is probably normal but I would think the devices would learn an optimum draw rate and attempt to hold that.
The voltage was right on, whatever the display said was within 0.1V of true input voltage measured at the terminals, but it did vary by ± 0.3V or so as the cycling was happening. I think with larger wires on the input side I would have seen less of this.
With 2 units being charged and both screens on, the max input power was 13.3W (14VDC at 0.95A). The charger reported 3.63A on the output side at that setting. 3.63*5V = 18.1W, which is definitely not happening (output power cannot be more than input power). So either the amp reading is correct, but the output was drawn down to 3.7V as more time is spent with the gate wide open to the battery (most likely), or the output voltage is really 5V and the current is overstated. I didn't attempt to connect to the output side, so I don't know which is correct. The current readings were more reasonable (within 10% of input power assuming 5V output) at lower charge rates. I ran the unit for hours in my car and noticed that it was barely warm, so its power conversion is quite efficient.
USB charging can be pretty involved with few standards, so without more measurements, it's hard to say whether the current is correct, but it definitely followed the loads I was giving it.
The charger was not enough to keep up with my Galaxy Tab S, but almost. It will drop maybe 10% during a long trip in bright sun with bright screen, even with big cables. But this is no different than my Anker charger, which I consider to be excellent. So the unit supplies at least as much as the Anker which is rated at 4.8A total, and it is a beast, so I suspect the charge circuitry on the tablet is just not up to the task of keeping the battery at 100% in bright sun with the screen on 100%, no matter what charger is used (the Anker and the Jebsens have done the best I have seen). Adding a phone to the mix made no difference to that result, so it is not a power supply problem.
Overall, a good unit. Please comment if you measure and compare the output current.