BONAI Portable Charger 20000mAh Power Bank 4 USB Output & Dual Input, Aluminum Polymer External Battery Pack for Road Trip Camping Compatible with iPhone iPad Smartphone Tablet etc. -Rose Gold

The product i'm reviewing is for the white 20000 mAh Power Bank.It came in a simple box with two 1' male USB-A to male micro USB-B cables, a manual, and some other product/customer service papers. The battery pack itself weighs in at about 14 oz. On first inspection, it is well designed with no observable or palpable weakness in the case. There are two female USB-A ports located at the top of the pack for charging your phone with the two ports separated by the flashlight. On the upper left side, there are two female micro USB-B ports for charging the battery pack itself. The flashlight button is slightly recessed from the case preventing accidental activation and button presses were firm and clicky, providing a nice tactile response. Operating the flashlight was also very simple; two quick presses to turn on or off the light, useful in case of any accidental presses so that it won't drain the battery life in your pocket or bag. The picture attached shows the product's dimensions, but here they are: 6.75" x 3.5" x 3/4".For easier personal use,I got some rubber bands and banded the two micro USB cables together, as seen in the attached photos. That way I won't lose them as easily and they'll be a dedicated charger for the powerbank. The cable build quality seems to be of average build, with adequate strain relief on each side. Personally, I wish it came with a custom cable with a single wire that had two heads, but including two separate cables allows versatility, allowing the charging cables to be used to also charge a phone/phones and not just the powerbank. The flashlight has a narrow beam pattern compared to my phones light/flash, but it is bright enough for emergency purposes. If you don't wish to use the light on the battery pack, you could always charge your phone and use the phone's flash as your light source, but it's always good to have a fallback just in case.To test the product, I first fully charged it until the 4 LEDs no stopped blinking, indicating a full charge. I then used it as my primary charger for my Samsung Galaxy s8 until the powerbank provided no more power. I have been using the app, AccuBattery, to keep of the charging history, charging time, and discharge history. Based on the estimates of AccuBattery, the battery of the s8 is designed to be 3000 mAh, but the estimated battery health and estimated capacity are now at 95% and 2853 mAh respectively. To preserve the battery of the phone, I generally never let it run empty and I only charge it to 80% to keep the non-replaceable battery wear to a minimum. Charging the battery to 80% usually provides me a charge for ~24-27 hours until it hits 20%, so I charge once a day. The powerbank provides enough power to fast charge my phone, reaching the 80% mark within an hour of initiating a charge.Presented below are the charge percentages of the phone over the course of a week.1. 23% → 80% = 57%2. 20% → 80% = 60%3. 26% → 80% = 54%4. 07% → 80% = 73%5. 21% → 80% = 59%6. 21% → 82% = 61%7. 11% → 73% = 62%Total % charge = 426%This roughly equates to charging the phone 4.26x if the charge were to be from 0%. This is a little less than what the manufacturer estimates at 4.5x but then again, the charger has the capacity to power a single phone for more than a week.To complete testing, I decided to charge it on my Ravpower 6 port charger, using the two cable charging method. Having the stopwatch on my computer on until the LEDs stopped blinking, it took about 5 hours and 20 minutes.Overall, the product does as it is designed and I was able to fast charge my phone for a week using solely the powerbank. It should work great for long travels for a single phone or short trips for multiple devices without access to a plug.

So, to try and sum everything up. My wife has this bonai charger I got about a year ago. It impressed me so much, I bought a usb backpack so I can have my own charger. I did what it said and used a 5v charger, or get an iPad charger, same same. It took about 6-8 hours to fully charge. You can use a micro usb or lightning cable if you have 12-14 hours to spare charging, and that’s from experience. I made a list to make it easier.ProsCharges fast with the right adapter (5v2a)Charge lasts foreverI’m on charge 3 for iPhone and it’s on 4 dotsIt’s got 4 slots for charging stuffIt will charge a tablet or phone quickIt’s not expensive for the qualityMust I go onConsToo heavy for weaklings, lolCan’t manhandle input charging connectionsEverything is labeled to clearlyToo much pride and quality put in productCaptain Obvious says, get this product or other bonai products, cause that’s what I’m gonna do to support this company. I can’t really say anything bad about it. I have to make up Cons. If you got unlucky and got a glitched product from an assembly line (duh, it happens), get another one and move on.

I bought this back in 2023 and it lasted a great two years! I’m about to get another to replace it.. worked perfectly! 10/10

I LOVE this! I bought it because I was enumerating for the USCB and finding that my census phone (an Apple 8) would run out of power long before the end of the day. My sister has a few portable chargers, so I looked for one just to make it easier. I didn't want to spend a lot, because I didn't have any Apple products of my own and would be turning the Census phone back in after we were done - but when I found this one (which works with Android devices too), I figured, why not?It did just what I needed it to, and lasts quite a while. I've only had to recharge it one time, and that was only after recharging my census phone at least a dozen times, and my iPad (I bought one in the middle of Census) and Android each at least one or two times.Only two drawbacks - it's a heavy bugger. My sister's batteries were fairly small and light enough to stick in the back pocket of your jeans, or in a coat pocket. Not this one. No way could you carry it in your pocket, and probably wouldn't want to carry it in your purse (though fit wouldn't be a problem, it's not that big). Carrying it in my Census bag added enough weight that I only stuck it in there as long as I was using it to charge the phone. Thankful that the charging process is pretty quick - a lot of times I could detach it within an hour or two, fully charged, and throw the battery back in the car again.The second drawback is that you need to remember to make sure it IS charging after you plug it in. There is a little round switch on the battery that sometimes needs to be depressed at least once before it starts charging. A couple times I plugged the phone in, not realizing it wasn't charging, and it got down to less than 10% before I realized it.Those two things are the only reason I gave it an overall 4-star rather than 5 rating. But as for the rest - Battery life, taking it along traveling, or how long it lasts - 5-stars all the way.