A Dozen Chargers in the Lab

By Sean Sullivan on 18 Jan 2026

A Dozen Chargers in the Lab: Apple is Okay, but Not the Best

Your intro goes here.

What I Tested

Your overview of the charger collection goes here.

How I Tested Them

Your methodology section goes here.

The Results

Your results intro goes here.

Charger	Advertised (W)	Voltage (V)	Current (A)	Actual (W)	Difference (W)
Eero 15W Charger	15	4.7	3.0	14.4	-0.60
Shargeek Macintosh Charger	27	8.9	3.0	27.0	0.00
Apple 30W Retail Charger	30	14.45	2.0	29.5	-0.50
Apple HomePod Mini Charger	20	8.6	2.0	17.5	-2.50
Vebner GaN 65W Charger	45	14.6	3.0	44.7	-0.30
Govee Power SupplyUSB A Only	10	4.5	2.0	9.3	-0.70
Counterfeit AT&TUSB A Only	10	4.7	2.0	9.6	-0.40
Counterfeit Samsung	10	4.4	2.0	8.9	-1.10
Amazon Kindle Charger	9.36	4.9	1.8	8.9	-0.46
Counterfeit Chinese Wall ChargerUSB A Only	10.5	4.5	2.13	9.6	-0.90
Dealworthy Charger	15	4.6	3.14	14.5	-0.50
Anker 621 MAG GO 5000mAh Battery	12	4.74	2.43	11.54	-0.46
iPhone 17 pro	4.5	4.81	1.12	5.39	+0.89
Macbook Pro M1	15	4.6	3.04	14.0	-1.00
Anker ASPD053a	40	14.55	2.7	39.4	-0.60
Apple 96W Macbook Charger	15	4.68	3.03	14.21	-0.79
AOHI GaN Charger	15	4.93	3.03	14.99	-0.01
Anker 637 Magnetic Charging Station	15	4.74	3.04	14.4	-0.60
Spigen PowerArc ArcStation Pro	15	4.54	3.04	13.79	-1.21

Charger	Vpp (mV)	Noise Rating (Graph 1)	Ripple Rating (Graphs 2 & 3)
Macbook Pro M1	24mV	⚡︎⚡︎⚡︎⚡︎⚡︎	N/A
Anker 621 MAG GO 5000mAh Battery	36mV	⚡︎⚡︎⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎⚡︎
Spigen PowerArc ArcStation Pro	56mV	⚡︎⚡︎⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎⚡︎⚡︎
Eero 15W Charger	60mV	⚡︎⚡︎⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎
AOHI GaN Charger	72mV	⚡︎⚡︎⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎⚡︎⚡︎
Anker 637 Magnetic Charging Station	76mV	⚡︎⚡︎⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎⚡︎⚡︎
Counterfeit Chinese Wall ChargerUSB A Only	84mV	⚡︎⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎
Apple 96W Macbook Charger	92mV	⚡︎⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎⚡︎
Apple 30W Retail Charger	96mV	⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎
Anker ASPD053a	128mV	⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎
iPhone 17 pro	136mV	⚡︎⚡︎⚡︎	N/A
Shargeek Macintosh Charger	152mV	⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎
Govee Power SupplyUSB A Only	164mV	⚡︎⚡︎	⚡︎⚡︎⚡︎
Dealworthy Charger	212mV	⚡︎⚡︎	⚡︎⚡︎
Counterfeit AT&TUSB A Only	260mV	⚡︎⚡︎⚡︎	⚡︎⚡︎⚡︎
Amazon Kindle Charger	288mV	⚡︎⚡︎	⚡︎
Apple HomePod Mini Charger	308mV	⚡︎	⚡︎⚡︎
Vebner GaN 65W Charger	332mV	⚡︎	⚡︎
Counterfeit Samsung	468mV	⚡︎	⚡︎

Macbook Pro M1

Overall rating: ⚡︎⚡︎⚡︎⚡︎⚡︎

The macbook pro has the cleanest power signature of the devices I tested. This was to be expected, since a MacBook Pro is just pulling DC current from its internal battery and sending it out. No AC->DC conversion required. There's also no high frequency switching noice, or any noticeable ripple. This makes sense, since it doesn't have to swtich thousands of times a second to step down AC voltage into something manageable.

Anker 621 MAG GO 5000mAh Battery

Overall rating: ⚡︎⚡︎⚡︎⚡︎⚡︎

Again, another battery, so good power quality is to be expected. Nothing major here. No noise, clean power signature. This is a good one to have.

Spigen PowerArc ArcStation Pro

Overall rating: ⚡︎⚡︎⚡︎⚡︎⚡︎

I was originally skeptical of this one, due to some prior tests that showed higher noise. This was marketed as one of the first GaN chargers, being released sometime back around 2023. Luckily my original test was flawed and subsequent runs proved that this is a very high quality charger. One of the best I've tested. It's using a ~140KHz switching frequency, which is high enough that you can't see any ripple on the 50us graph. I zoomed out and there was a tiny amount of ripple, but not enough to be noticeable. the zoomed-out graph looks pretty similar to the one in this image, so i'm just showing you the zoomed in one here. Good charger.

Eero 15W Charger

Overall rating: ⚡︎⚡︎⚡︎⚡︎⚡︎

This one made me mad. For such a random charger, one that you can't even purchase yourself, it is remarkably high quality. Some ripple exists in the switching frequency, as you can see on the bottom graph, but it does a great job at filtering out the AC noise (which would show up as a higher 'floor' on the purple graph). It's got a sawtooth waveform, so there is noise, but it is pretty small. Incredible charger, especially for its size.

AOHI GaN Charger

Overall rating: ⚡︎⚡︎⚡︎⚡︎⚡︎

This one performed very well. It is marketed as a GaN charger, and uses some components that are so new they have never been used in consumer chargers before. So this charger really should be considered a flagship. for that reason, I'm a little disappointed the power signature isn't better. It IS very good, but for how bleeding-edge this charger is marketed out to me, it performs comparatively to chargers half its size and price. One future test I might do is examine the charger at higher power output. I didn't push it to the 100W limit in testing, but that is becuase I was using small wires that could have overheated. the charger might perform better at higher power output.

Anker 637 Magnetic Charging Station