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)

Really works great. My laptop went bad. But the battery pack was good and never had charging issue. I took the batteries out. It takes some careful tinkering and cutting. But I’m now able to use it in this device and power up a lot of things. I am very happy with the performance of this device.

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.

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.

Great way to put your loose 18650’s to work. It appears to balance the cells. Shows individual cell conditions on display. I recommend.

works as stated. great use for those batteries, if which i have many.

It's decent value and good for charging, but even on 4 full 18650 batteries I can only get 0.7 amps out of it. That would probably be fine if you only want to slow charge your electronics, but if you intend to use this for your phone look elsewhere. I wish I would have read the reviews about the poor power output before I bought.

I take out the 18650 batteries from "dead" power tool packs (looking at you, SunJoe). Often there are only a few bad cells, and the rest are perfectly good. This allows you to build a powerful, long-lasting battery pack at minimal cost and with no soldering. Just put your good cells in, snap the case closed, and you're done. These are just about the least expensive I've found.

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 four Cons: - No USB-C output - Slow charging with low output at 0.6A - Charging doesn't seem efficient and loses a lot of charge quickly It needs better charging output, more efficient charging and a USB-C output for more versatility.