Power-Bank-Portable-Charger - 40000mAh Power Bank QC 4.0 and PD 30W Quick Charging Built-in LED Display 2 USB 1Type-C Output Compatible with Most Electronic Devices on The Market(Dull Black)

I bought these because all of my local big chain stores were only selling 20000mah models at the same cost with slower charging speeds. These blow them out the water. Loved it so much, I bought a second one for my mom. They work well, charge my phones fast, hold charge for a while, and has a very bright light that comes in handy when I'm trying to dig around my car, my gear bags, or can't find my phone to turn on my phone flashlight at night when I don't want to wake people up. I wish it came with some more cables, and being limited to 3 ports is bleh but I knew that going in and still clicked buy so that's on me. Not any fault of this product. All this product does is work extremely well at an extremely affordable cost and with more features than most of the big names want to offer, along with a lot more capacity. Dang. It really does do a lot! Buy it if you need it!

Picked up this PD30W power bank and it quickly became my go-to lifesaver. Its sleek matte finish feels sturdy, and the digital display gives instant battery percentage—no more guessing! The 30W PD port juices my phone fast, while dual USB slots handle two devices simultaneously. Bonus flashlight is surprisingly bright. It’s portable, reliable, and ready for adventures or daily commutes. Highly recommended, absolutely, without hesitation.

Assuming a valid computation of the power bank's capacity based on how long it takes to charge some device is erroneous. Different power banks have different charging circuits which can substantially invalidate the computation. And for using discharge-time to calculate how much power bank capacity is used to charge a phone, different power banks may vary many10s-of-millivolts, which will vary the time to charge the phone enough to make this assumption invalid.A better way to test a power bank's capacity is to get a "USB tester." They're surprisingly inexpensive, and they all have accurate calculators that display how much charge(mA-hrs) is delivered to a device (or power bank) under charge, including the total capacity when charge is completed. It occurs to me that it would be accurate to tally up the milliamp-hours going into a phone's battery by turning off the phone while it's charging, so the tester will only be tallying up battery-capacity, without the phone using up any charging current. Of course, for measuring the capacity of a power bank, you don't have to worry about charge going anyplace besides the battery.If you want to determine the total capacity of, let's say, a power bank, Step 1 is to discharge the power bank all the way. Discharging the power bank completely is not a nice thing to do to its lithium battery, so I try not to do that test, myself. But if I ever do the test, I'll update here with a result.In practice, I like keeping one of these monster power banks near my seat, if I don't have an AC USB charger nearby. And I like the bank's small digital display of remaining percentage to tell me that the power bank needs to be recharged before it gets over-discharged. And, just to make trouble, if the percentage readout were off by a few percent, the display is still sufficient to help avoid over-discharging the power bank so if achieves long life (and prospers). Instructions say to recharge the power bank before it drops below 25%. I would add "... if you have the chance."To treat my cellphone batteries most gently, I like to charge them most slowly (if I'm not going anywhere, such as during bedtime). A USB tester will tell you if a quick-charge method is increasing the charge-voltage above 5 volts, which may be quicker, but that's not the healthiest way, generating heat inside the battery, etc. I must remember that the power bank's USB-C jack is not only an input for charging the power bank, but it also can be used as an output to charge a device, for a total of 3 outputs from this power bank(!). I'll have to get my USB tester to confirm the USB-C jack is a plain, no-quick-charge output.

Why did you pick this product vs others?:Though not as much as advertised, this charger holds enough to recharge mobile phones and tablets multiple times over. Charging speed was very good for a mobile charger. E.g., for an iphone 15, took about an hour to go from 20% to 70%. The number of ports was sufficient for my needs but that's certainly going to differ person to person. While portable, it is very heavy. Lugging it in a backpack is ok but anything smaller is unwieldy. It has a sold build quality. The percentage charge remaining is a very nice, almost a necessary, feature. The built in flashlight is an interesting feature, not one that I don't think most people would use (since everyone's phones has a flashlight). If you have need for this capacity charger, this one is a good one to get.

I love this charger. The capacity holds up, we had a few power outages here and it lasted multiple phone charges and i was even able to charge my laptop. The flashlight is nice and i think it isn't too “extra”