Charger 5V 2A 2.5A 3A 3.5A for Raspberry Pi 3 2 B+ Power Supply Adapter Fast Micro USB Rapid Extra Long Cord USA UL Listed 2Y Warranty
- Make sure this fits by entering your model number.
- FEATURES / POWER SPECS : Only Pwr+ Chargers Have Extra Long 6.5 Ft Power Cords / Smart Power: 5V 2A 2.5A 3.5A 5W 9W 10W 15W 18W Powerfast Quick Rapid Fast Charger (NOT Q C 3.0) / Steel-Reinforced Micro-USB Tip for Extended Usability / Made in Taiwan / Original Official OEM Genuine USB Charger and Power Adapter Replacement by PWR+
- COMPATIBILITY: Raspberry Pi 2 3 B+
- SAFETY / UL LISTED: Tested, Approved and Certified by UL, UL number is unique. UL testing is authorized by OSHA - US Federal Agency
- WARRANTY: 30 Days Refund - 24 Months Exchange. PWR+ is WA, USA based company. We are friendly Customer Support Experts
Frequently bought together
Bargain Finds related to this item
Customers who viewed this item also viewed
Have a question?
Find answers in product info, Q&As, reviews
Your question may be answered by sellers, manufacturers, or customers who purchased this item, who are all part of the Amazon community.
Please make sure that you are posting in the form of a question.
Please enter a question.
This charger is perfectly compatible with Raspberry Pi 3 2 boards and other Micro USB devices. All PWR+ chargers come with extra long power cords. Product Manual is included
Just like an original charger - this power adapter is Tested, Approved and Certified by UL. UL number is unique and verifiable on UL website. We manufacture our products in Taiwan to ensure highest levels of safety and performance of your electronics.
Multiple safety and performance features that work together to provide ultimate protection and fast charging for your devices
We will Not bother you with offers and promotions
We will send you Only 1 follow up email
We obsess about making you happy with our product. Give us a try and we promise to deliver!
PWR+ Powering Millions of Laptops, Tablets and Electronic Gadgets worldwide PWR+ is WA, USA based company with manufacturing facilities in Taiwan. We stand out from the rest by offering genuine UL Listed and efficiency Level VI power adapters.
We are friendly Customer Support Experts. Please contact through "Your Orders" tab in Amazon account (allow 24hrs for reply)
Compare with similar items
There was a problem filtering reviews right now. Please try again later.
Thankfully, this supply *doesn't* appear to be in either category! While I haven't physically opened up my unit, I can tell by the amount of noise, ripple and switching artifacts that they're using a decent design with proper output filtering (which is usually the first thing dropped on cheap supplies).
I've uploaded two photos to my review. The first one shows PWR+ adapter and test setup, the second shows voltage and current waveforms from the adapter under various loads. In that image the first 3 rows and columns show the current and voltage waveforms from idle to 4A, in 500mA steps. The last two shots show a closeup of the voltage waveform (AC coupled, 20mA/div) at 3A and 2A loads, respectively.
As you can see, the adapter does well with loads all the way up to 3.5A. While, overall, the switching noise is on the low end, there is a noticeable increase in high frequency noise with loads greater than 3A. However that's not unexpected nor a big deal. If it's an issue for you (using your Pi as a 384kHz/32-bit DAC, for example) the noise can be negated by attaching a snap on ferrite choke (RF filter) to the microUSB end of the cable. (I keep a dozen or so 13x25.2x3.5mm filters on hand specifically for attaching to the ends of AC adapter cords.)
I also tested the supply under burst conditions (5A 1us pulses on top of a sustained 1A load, which simulates a SBC such as the Pi doing brief, intense I/O and processing operations) and the adapter was able to cope without more than a 100mV drop in voltage. With pulses longer than 10us the supply starts sagging quickly, which is expected as it's the output capacitor of the adapter that supplies this current and once depleted the adapter is unable to cope with the load. Burst tests at 3.5A or less showed favorable results. The only test the adapter failed was when going from no load to full load. In those cases there is a period of around 100ms where the voltage declines before the adapter catches up; this is due to the adapter operating in pulse skipping mode at low loads. It's only a minor point but worth mentioning.
Finally, I did a burn-in test, running the adapter at 4A for 24 hours. It survived fine and didn't heat up by any appreciable amount. I should also mention this supply *does* indeed contain over-current protection, which seems activate at 4.5A.
For those of you who don't have engineering degrees, the gist is this: The supply delivers 3.5A at just over 4.65V, which is more than enough to power an *overclocked* Raspberry Pi 3B+ plus attached USB devices and fan, *without* any of the dreaded "lightning bolts" appearing. To be honest, 3.5A is really pushing the limits of the microUSB connector.^1 That's your bottleneck, as the contacts are so small they add appreciable resistance, which lowers your voltage as the current increases.^2
Finally, the build quality of this adapter is very nice. It has a solid feel, with no creaking or flexing when squeezed like you get on cheap adapters. The cable itself appears thick and has strain reliefs on both ends; the microUSB connector also appears to be of the higher quality variety.
All in all I'd say this is a winner for the Raspberry Pi 3B+ or other high powered SBCs; it's cheaper than the official adapter and provides more current. Likewise, for non-SBC uses (charging phones, tablets, etc.) this should also work great.
^1 - This is why USB-C doesn't deliver 5V, but instead supplies a much higher voltage at a lower current, which can then be stepped down to 5V at a higher current on the device itself. The reason smartphones and tablets can get by with microUSB at higher currents is that they don't need more than 4.2V or so to charge their batteries, so they can deal with the voltage drop.
^2 - Frankly, if your Pi (or other SBC) needs more than 3A you're much better off getting an adapter with a male 5.5x2.1 barrel connector on the end of the cable and then wiring up a female socket that plugs into the 5V and GND pins of the GPIO header. (In that case, be careful! The GPIO pins have no reverse polarity protection!)
I have two of these supplies that have been going strong since August 2018 and am about to purchase a third. :)
One thing I did forget to mention in my initial review, the microUSB connector:
Another reviewer mentioned issues with his microUSB connector breaking after a year, however he was using the supply with a tablet, so that’s to be expected. A microUSB connector is only rated for a few hundred mating cycles at the most. Most Pi users will only disconnect/reconnect a few dozen times (assuming the Pi is used for a set purpose, like a media player or emulator) so that’s something that shouldn’t be an issue. If you use your Pi for experimentation and need to turn it off and on a lot, I’d reccomend getting an in-line microUSB power switch, or unplug the adapter from the wall instead of unplugging it from the Pi.
The ASUS T100 series tablet/netbook computers fit a niche in the middle of the Windows tablet range, and the bottom of the Windows laptop range, replacing those handy little netbooks of a few years back, but they have one common issue: battery charging. I don't know if it is the battery, or ASUS hardware or software, or if it is Microsoft's power and battery management software, but somehow these things tend not to charge when they should, and run down the battery. Update the firmware, replace hardware, sacrifice small innocent animals to the digital god of your choice, and it won't help. If your unit has this issue you'll end up with a dead tablet because it sticks to "Plugged in, Not Charging" until the battery runs down and the system crashes, seemingly never to reboot - (and bonus, without warning, moments after claiming 70% or more charge left!).
First, a tip to recover - the only thing I've found that works. Put it on charge and just wait. I know, at first you'll only get the battery charging screen, or perhaps not even that, and just the power light flashing 4 times and then nothing, but be patient. This seems to work much better if you DON'T use the original ASUS charger, and don't use this excellent charger either. Use a puny charger from the old days, capable of putting out 500 mA or less. I have a wimpy USB charger intended for charging low-end vaping batteries, rated for 400 mA, that has worked for this purpose a couple of times, when higher capacity chargers would not. Give it over night at least - it may take a day or more. Then you should find that your T100 will boot, complain of an improper Windows shutdown, and recover nicely. Put it back on the "real" charger right away to complete charging. Apparently the software has decided that it shouldn't charge, and just won't, not matter what. The wimpy charger fools it.
Charger: "No charging going on here, just trickling uselessly boss." Computer: "Alright, so long as you aren't charging, I'll ignore you, you pathetic little creep, but try charging and I'm opening the circuit on you!" And slowly, despite the computer's best efforts, the battery very sneakily charges. At least that is my theory.
This "recharging from dead" should reset the battery charge level software, but I'm not sure it does, at least not correctly. The entire charging system on these things seems to provide no useful feedback and an epic amount of trolling - I suspect by design.
There is a whole school of philosophy on how to keep these things from getting into this funk, and of properly charging the battery (e.g. don't leave charging when not in use), but none of it seems to work reliably in every case. I think the battery has swelled in one of my (still working) T100's and I have a replacement battery on site (which I'll review after it goes into service). This issue isn't unique to the T100, or even to ASUS, but the T100 especially and ASUS generally, seem to suffer from it more than any other computers I know of.
Anyone who thinks they know the secret to solving this issue, feel free to call me a fool in your comments, so long as you explain your solution, along with how you know it really works.
These chargers do seem to work better than the original ASUS, (and that long cord!). I've had one T100 go into "battery funk" on one of these chargers (the older design), but they do seem to provide better power, while generally keeping this issue at bay, with a cable long enough to use the tablet more than 6 inches from an AC outlet.
Warning: don't try games with long USB cables on the original ASUS charging cube. Most won't work. A few, especially made for charging, will. They've managed to make a complete mess of USB charging (and charging generally), with more competing "standards" than you can shake a stick at, and I've not bothered to track down the exact issue.
So... Power issues are about the only Achilles heal to these tiny computers, and these aftermarket chargers, while not a blanket solution, provide good power, and do it far enough from the AC outlet that you can use the computer while it is charging. These are the best friend your T100 will ever have.
In need of a replacement, I purchased 2 more cords for my travel needs and another for my husband. It's been 2 months and both chargers have bent/loose connections and do not stay plugged in well.
I like the first one I bought years ago but sadly with the updates they've made since then they've lost the quality so we're on the hunt for new chargers.