KBT Removable Battery Charger for 3.7V Rechargeable 18650 Batteries (Battery Not Included), 2A Fast Chargers with 5 Slot, for DIY Charger Case

Unit does not come with instructions. But, very easy to figure out. Just put some batteries in and the lighting on the front is a button to show the percentage. Hopefully that helps someone. I am definitely buying another one. Just make sure you get the screws. You can use it as a charger or power bank.

I disassemble these and use them in custom power supplies for various portable 5v projects and love how versatile these are. The board clearly marks which terminals are for what so its easy to add your own port(s) and the screen makes it easy to figure out if everything is working.

Love the versatility of these

While this has 5 18650 slots, I found in testing that it will work with less.Initial use shows this to function exactly as advertised, and is currently charging up an LED headlamp I use regularly.The % charge and 'out' are displayed only after a device is connected for charging, and the % disappears after a few seconds to conserve power.Will update with further use, but 5 stars on initial impressions.

I'm not very fond of products that don't come with any instructions of any kind. This charger came in a white package but didn't have anything with a description of the specs or even how to open it. I just decided to pry it open after turning it over and over to look for a latch or clasp. It turns out that when I did open it, I found a small screwdriver and very tiny screws that are intended to hold the case together with batteries installed in it.Essentially, this is a battery enclosure that allows you to remove the batteries within it for whatever reason you choose. With the batteries installed, you can use the set as a power bank. I ordered this item thinking that it was a charger as described in the description. I'm not quite sure what use case would require that batteries be removable for a power bank. Changing the batteries for charged ones when they are depleted suggests that you have a means to charge the batteries some way. Why wouldn't you just charge the device directly with the power source? Plus one would have to remove all the tiny screws to change the batteries and try to avoid losing them.I'm puzzled by how one would use this as an enclosure but, I'm using it to charge my 18650 batteries instead. Seems to work fine for that.