LIJIANI Battery Charger Case,Portable DIY Power Bank Box with LCD Display 2 USB Output,Micro and Type c Input, Smart Charger for 3.7v Li-ion Rechargeable Battery (Battery Not Included)

I have been using this for a few weeks now and find it very useful especially when charging 18650 cells, which is the primary reason i bought it. Although I have been in a pinch a couple of times now and it works as effortlessly as a portable battery bank for recharging my phone and other usb powered devices. My only dislike of it is that i am not 100% sure if it balance charges or not and after seeing some horror stories about imbalanced cells i have not been adventurous enough to put cells with different states of charge in it. But for what it is it works better than i would expect for the price.

Great idea. Multipurpose. Battery charger and a portable battery. Yes, they charge a little slower than some, but you have to give a little. Can't ask for everything. Some people are just spoiled brats if you ask me. It will even pick out the bad batteries. Would definitely recommend.

This case works great. Each battery has and indicator on the display to tell you if there is and issue with that battery. Its great for using with any spare 18650 batteries you might have. The quality it good, its hold 4 batteries and the power output and charging speed depends on the batteries you use. You can always change out a battery if there is an issue instead of having to discard the whole thing.

I like how you can use as a charger for 18650 batteries or as a battery bank

Works well. I am using batteries from old computer batteries.

Good product. One of the reviews said it came with micro usb, maybe that's the old version. The one I received is USB C charging port. Price is a little high but these days everything is expensive.

I have 4 5800 mAh 18650 batteries and took it on a walk while I had Pokemon Go open and the charging wasn't even enough to maintain the battery level. After about an hour my phone had dropped over 10% battery charge and used half the capacity of the power bank. The output showed 0.6A which is very low, might be good for slow charging but not enough to charge your phone while using which is the main reason I bought it. I use 18650 batteries for a lot of things so I thought it would be nice to have multiple devices that are compatible with those batteries.Pros:- Small and compact- 18650 batteries can be swapped out with fresh ones- Can be used with one battery if needed, or less than fourCons:- No USB-C output- Slow charging with low output at 0.6A- Charging doesn't seem efficient and loses a lot of charge quicklyIt needs better charging output, more efficient charging and a USB-C output for more versatility.

This was the perfect solution for the cheap Chinese 18650's laying around. It is all plastic, and just basic construction. It does the job, and is affordable. I like the crisp LED status display. With 4 cheap batteries, I ought to have about 4000 to 6000 mAhr worth of juice.