LHIABNN DIY Power Bank Box Flat Head Battery Charger Outer Case,2 USB Output Ports Plastic Shell Box with LCD Display,Micro/Phone/Type-c Input Port Power Bank Case (Black)

I grabbed this and a generic laptop battery for an asus laptop (just because all 8 cells were in a straight line which makes it easier to rip apart for the cells.) And I stuffed them in this SLIM box, probably 2-4 mm thinner than my old 8*18650 box, whose ports are wearing out now after 5 years of reliable work! So i saw this looked as if it was from a similar company. Rolled the dice and it works great. The usb C is an input only but works well with 5v 2A cell phone chargers, just watch out it isn't Qc or QI so no quick charging it or you will zap it with 12v which is bad lol... anyway good solid micro usb which i thought would be handy i haven't tried the lightening input yet but if its like the other 2 its good to go. I did a test with two 5v testers and i got 4.3 amps out of the two outputs and it did warm up but it didn't over heat or drain faster than expected. So it maintains a good conversion even while running two 2amp outputs. while my old one only did 3 amps and would overheat after about 20 mins, so i rarely ran it over 2 amps so this is a massive upgrade for me. Id say the biggest downside is it doesn't reopen without a lot of shims and time. It has small D shaped clips that are about ever 2 cm's down the seem. So yeah, pick a new battery and don't expect to trouble shoot it after its together, but the descript explained that. TLDR: Great, works at 4 amps consistently. Can charge two newer phones but not Qc or QI not even to charge it. But It does a great job and will probably be a life saver in air ports post pandemic!

Of the three power packs I have this is my favorite. I use while I'm doing bike deliveries so it needs to be either cheap or sturdy. So far this has been both. When using all slots I get a lot of life. Footprint is minimal and clear. Appreciate the batteries in parallel so I can steal them for other tools that use the wonderful 18650 cells. The build quality is poor. When first purchased there was some plastic that needed to be removed. Even then the case did not fully close on all sides. Plastic is very brittle. Even on the first close a few of the clasps snapped off when trying to close. Different plastic or latch design would greatly add value. In my opinion this is aesthetic issue and I'd rather be able to open and close (clearly goes against the design). I used rubber bands to keep it closed. Ended up being a handy way to keep the charging cable nearby. Anticipate rubber bands will prevent future cracks as well. Had I spend more than $20 on this I would be disappointed.

This battery bank is designed like early model battery banks I have bought in the past (early 2010-2014) Opting to use 18650 lithium style batteries cells rather than lipo bag style battery cells that are not as robust or have stability issues over time. Lipo bag style battery banks use a style of battery that is composed of thin battery cells in a foil bag. A common problem with this type of battery cell is that they are prone to failure. They are far more dangerous and in worst case situations. They can literally burst into flames with seemingly zero provocation. A simple search for “lipo battery fire” on YouTube will demonstrate what I’m talking about. Another more common issue is that the chemicals in the bags begin to off-gas which causes the bags to inflate and cause the case they are inside to crack open. This battery bank allows you to choose your own 18650 batteries and install them. So you choose the quality of the bank based on the quality of the batteries. What I like about this bank is that you don’t need to use all 8 battery slots. It can literally run off one cell or any combination between 1 and 8. However. The total amperage of the cells must not exceed 20,000 mah. I used 6, 3,000mah battery cells which brought me to 18,000mah total. This bank is not without its flaws. Once you lock the top and bottom half of the case together it’s very difficult to separate it agin. My guess it’s designed to be built once and used for the life of the battery cells. Much like a store bought bank. If you plan on using less than 8 battery cells like me. I have a few suggestions. You need to fill the empty section of the case so that a shock or impact to the case will not shake the batteries loose. Or secure the batteries in place. I opted to use extra thin 3m double stick tape on both sides of the inside case. This did not create any bulging or deformation once assembled. I tested out my build before locking the case together and I noticed that with fully charged and conditioned batteries that the percentage on the bank display showed between 81 and 84% when I first plugged the first battery into it. I tired this with sever batteries with the same result. Each time only inserting one different battery then the rest. After installing all 6 and letting the bank charge to 100% it would stay at 100%. Even after checking it via the side button 30 minutes later. However when I took out all batteries and reinserted them again I was at the 84% mark. My option. This is a general base line and the electronics package defaults to this 3/4 full mark so you will plug it in to charge. The bank needs to charge to 100% to get a “read”on the batteries that have been inserted into it. At first I felt like this was a bad thing but the more I thought about it. The more I consider it a good thing. The circuit board is not just blindly reading voltage and guessing a full charge. It is adapting to the cells installed and doing its best to determine what a full charge really is based on the fact that every battery and combination of batteries is slightly different and not all cells are created equal. High quality batteries like Samsung or LG (my favorite) will make for a better bank overall and it can be built for roughly 1/3 to 2/3 the price of a cheaper built pack with the same capacity. Just remember to not exceed 20,000 mah of total capacity in the batteries you use. Anything over 20,000mah will confuse the circuit board and cause it not to charge properly. A side note: the digital display has a plastic protective cover on it. Make sure to remove it before snapping the top half of the case together with the bottom. In my experience with other product that have this same kind of display, it will begin to peel over time and you don’t want to try to separate the two halves of this case. Trust me. Also looking at the case from the top. The left USB port is 2.1A output while the right is 1.0A output.

Second purchase. After my solar battery banks battery swelled up and nearly split the case, I decided to replace the battery. But it was some oddball proprietary Li battery and there does not seem to be a replacement available, and it was not designed to be replaced. 3 years and now its worthless. Spent 35 bucks so I could add to the landfill. So I decided to do it the right way and bought this battery bank housing. Works great. I know the batteries in it are good quality Samsung 2600, and thats a big plus. At 8x2600, in theory, I have 20,800 ma of power at my disposal. And the display is bright white and easy to see. The unit did get warm when charging but did NOT get hot. Thats a good sign. A couple things to note. After installing your 18650 battery's it is important that you run the bank down to zero before charging. Charging in a bank configuration will "balance" the batteries as a "bank". That will insure that no one battery is being overworked and reduce the chance of failure. After that, charge as normal. The bank is not designed to be a charger. It is a "bank". Get a smart charger if you need batteries for other devices. Try to match your batteries as far as value. IE 2000, 2500, 2600 etc. Best advice is to purchase new batteries of the same brand and value. The case is not easy to open so do your discharge, charge and testing prior to closing the case. The case does not have saddles in the body to hold the batteries secure so I used a hot glue gun to hold them in place. Tape or contact cement would probably work just as well. Same way laptop batteries are secured. So far, very pleased. I will update in the event of a failure or problem.

This device looks good, but doesn't live up to the seller's claims. It doesn't even put out a full amp when using the higher rated port (neither port has a label other than the word "OUT" listed above each port, but one puts out around 250mAh, the other capped at 691mAh). I loaded it with 8x 18650 flat top, unprotected cells all rated at 4.20~4.22 volts/2000mAh each. Charged each battery to capacity with a standalone charger I use to charge my vapes, so I know it's good, and fully charges 18650's to their capacity quickly and efficiently. After fully charging and checking their voltage to ensure they were all as close as possible, I loaded them into the device. It immediately registered as full/100%, but I plugged it in for about a half hour using the USB-C "IN" port (not sure yet if the USB-C port conforms to USB standards and allows for power to flow both in/out from the same port. I'll update later to confirm) while using a load tester to see if the device was registering as "Full" properly. My tester showed that it was still drawing between 250~500mAh after at least 30-45 minutes of charging (keep in mind each battery is fully charged already using another stand-alone charger), which tells me the device doesn't know that it's already at capacity. After unplugging/stopping the charging cycle I moved on to the discharging cycle, and while trying to charge my Samsung Note 10+ 5g for over an hour I can see with my load tester that the powerbank is only putting out a consistent 691mAh. I've tried at least 4 different cables ranging from 3"-3' (3 inches to 3 feet), and the output is the same, meaning the device is the bottleneck. Anyhow, if you get this for less than $15 USD, and want a quick DIY powerbank that *could* charge your phone/USB devices, go for it, but don't expect much. The built-in LED flashlight is nice and bright, but that's pretty much the only stand-out feature sadly... TL;DR Very slow power delivery output Not an intelligent device by any means, probably ignoring rated capacity of installed batteries Not Recommended For Any Emergency/Go Bag!

It works fine, but in the 7 segment led display, half the segments are dead on the least significant digit. The power bank works fine and is as advertised, but the broken display is irritating. After draining it to zero and recharging it, the display showed what I believe to be 100%. Hard to be sure with the dead segments.

I use it as a workbench tool for recovered laptop batteries after measuring their voltage and matching them as needed. I have been using five, same type, same voltage. My DIY solar generator recharges it very easily and quickly. In turn it re-charges most rechargeable portable USB devices and power-banks. So far only one, very old power-bank failed to charge. The cover stays off based on other reviews saying cover is hard to remove once sealed. Electrical tape is used to secure batteries for safety and in case of minor accidental fall. This device beats soldering my own 18650 battery bank at a reasonable price. I occasionally swap out batteries with other 18650 batteries. A removable cover would be my primary wish for this device.

This battery bank does the job. I haven't been able to do a "Fast" charge on modern phones, but still charges all my devices without any issues. I tested the capacity and was able to fully recharge my Samsung Galaxy S22 Ultra 3 1/2 times using re-furbished laptop batteries. I would imagine that using new 2500 mAh batteries would give more charge capabilities. I have been able to re-open the case once closed but it needs to be reopened very carefully. All in all, I am pleased with this charging bank, and if/when the batteries age they can be replaced rather than tossing the whole unit in the garbage.

Works good, great to repurpose old lap top batteries

Was cool and worked to charge but refuses to charge just sits there saying in what a waste i put good cells in there too-.-

Works but the it arrived with a faulty display. It cannot display all numbers correctly as it has dead pixels

I installed battery inside heavy but works well beside struggling to close it.