FOLOMOV Key Charger,Compact Magnetic USB charger，2A Charge And Discharge，With Battery Capacity Display， And Power Bank Function

I am writing this review after a week of use and after charging several batteries of varying levels. I charged 18350, 18500, and 18650 batteries of varying capacities. My experience has been good so far. If that changes, this review will be updated to reflect this.This charger will charge any Li-ion battery that fits into the recess up to 21700. No LiFePo4 or NiMH. This starts charging at a rate of 2 amps and slows down as the battery comes to full charge. As such it charges batteries at a fairly rapid rate. This might pose a problem for some smaller batteries if they cannot handle the higher charge rate. The user should be mindful of what their battery can handle.This charger also acts as a power bank with a battery hooked up. This will charge/power any device that you can plug into the standard USB port. I did not test this extensively, but it does work. There are four green LEDs to indicate the level of your battery whether charging or discharging (power bank). These work as intended but only give an approximate indication of the battery level.This charger is small. Only slightly larger than my truck remote. This is a charger I will probably leave in my vehicle or toss in my pack when I travel. It is lightweight and doesn't require any special cables to work. However I would caution checking to make sure your device cable will fit into the charger output. I have a couple that the the plastic molding is slightly too wide to fit into the port. I suppose a little shave from my pocket knife would make it fit, but just be conscious of this limitation and test fit your cable before hitting the road. My biggest gripe is the fact that 26650 batteries will not fit due to the diameter of the battery. I would recommend Folomov revisit this charger and perhaps redesign it with 26650 batteries in mind since they would make excellent candidates to handle the high charge rate and have large capacities which would benefit the power bank feature.Overall this charger works well with just these few caveats and I would not hesitate to buy another should this one grows legs...

This was a convenient compact lithium ion battery charger / power bank that I was happy to have about a half dozen times. At home, in the car and the jobsite.... until the last attempt at charging a 1/3 discharged 18650 battery and the device LEDs fluctuated between 1 and 3 solid on for maybe 10sec then I smelled burnt electronics and disconnected. Device is now completely non functional except as a smelly paperweight 💁‍♂️ Good while it lasted

I just wanted to let everyone know, what a great Key charger this is. It was very easy to use and that it works perfect for an EDC (Every Day Carry) I was able to charge a very low Samsung 30q battery within about 2 hours or less. After it was charged I put it on my phone to charge it up, with the freshly charged battery. My phone was down to 33% and it charged it up to 100% in less than 2 hours. Great charger carry with you everywhere you go!!! Don't Think Twice go ahead and buy it.

Its a slick lil thing. I kinda wish for a slightly different cable setup as its often a bit short when plugged into my outlets but its really nice having a status indicator telling you where it is in its cycle. We use these on the boat to charge up flashlights and what not. If you're doing this make sure to keep an eye on them as fire can be massively dangerous at sea!

I really like how small it is and I don't need a plug in to charge my phone even outside. I just take an 18650, 20700 or 21700 with me if I'm going to be outside most of the day or night and when I am inside and I use it to charge a battery it actually charges my lithium-ion batteries to their potential. For instance, I can charge my batteries with my nightcore 4 bay charger and the nightcore display says 4.2 volts when complete. I can then place 1 of the batteries in this tiny charger/power bank & it will finish charging the battery to an actual 4.2- 4.21 or 4.22 I hope this helps or makes sense to someone. Will buy again.

Bought an Anker power bank for $10 more.

For the price I didn’t expect much.. but this thing is AWESOME! Works great for my 21700 cells for my flashlights. I really like the power bank feature to charge a phone as well.

The only reason this hasn't started a fire each time I tested it was because I used batteries with high quality protection circuits. They still smoke and it is incredibly difficult to get the device to recognize that there is a battery connected