4 Position Advanced Quick w/Mobile Charging Technology

If you want to know how to use this device, here's the simple tips in the next 3 paragraphs, but if you want to know why I think this product is so amazing, read the whole thing: Charging: Make sure you are using a USB power source that can provide over an amp of current. If the lights are flashing as you're charging, it will still function, but charge time will take longer and the end of charge determination won't be accurate so the batteries will likely overcharge some and become degraded faster (over the course of many charges). To avoid this, use a USB power source with a better current rating (this is partially a limitation of the charger and partially a limitation of the chemistry; NiMH gives a better end of charge signal when it is charged fast enough). Other than that, charging is pretty simple and straight forward. Watch out for bad connections; if a battery light doesn't show up, try spinning it a little bit while in the charger and it will likely clean up the contact points on the connectors. Power bank mode: There is a minimum current to keep the power bank on - if you have a very low load connected, the power bank will shut off after a minute or so. There are some circuits you can put together to trick this, but just be aware that it's there. Do not use "heavy duty" batteries in this or any 4 cell power bank; they won't work right because that battery chemistry can't supply enough current. Here's, in the technical sense, why I say this is the most advanced NiMH charger+power bank in existence: They created all this functionality using only one inductor. That's why you can buy it as cheap as it is, because the circuit is pretty ingenious and it avoids expensive parts. I don't know how to explain this to non-electrical engineers but if you did "the normal thing" you would expect to see 4 or 5 inductors - one for each cell and likely one for the USB input. And an extra circuit to start it up in power bank mode that might need like a joule thief style transformer. It wouldn't be viable to sell this at a reasonable price point. Basically, instead of treating each cell independently at the circuit level, there's a bunch of solid state switching to select which cells are in series and which are bypassed, so that at any given moment it acts like "one" battery, but the internal computer can reconfigure this quickly when it wants to so that it can end charging to specific full cells or balance draw in power bank mode. This device charges each cell individually (no problem for charge / size mismatch), and assuming it's in its -dV charge termination mode (lights aren't flashing) it charges cells nearly perfectly to capacity. Likewise this is not just a "slam all the batteries in series for power bank mode" thing (well, it is, topologically, but it can also bypass individual cells under computer control so it can work as if they were all separate!) - it is fully regulated in all aspects and enforces a maximum output current just like every other good USB charger. I think it even tries to balance the draw if you have a mix of AA and AAA batteries in it but I've only tested it with 1 AAA + 3 AA scenario but it handled that well. If you made it all the way through this review, I hope you got at least a quarter of the excitement that I had when I first took one of these apart and was amazed at what I saw inside it.

Charges 1-4 batteries at a time via a Micro USB cord. Can also be used as a backup battery pack to charge other objects. Has held up really good so far bouncing around in my backpack.

Great quality, the cover does come off. This charger uses the older USB-B cable which can be annoying to carry around an extra cable for just this. Charges at a moderate pace, its incredibly useful that it shows the state of the battery. I got this with a pack of eneloop pro batteries and it was a solid price. Again, that charger is a little annoying to be having around.

this little thing is so great. i can recharge my batteries regardless of the voltage available because i just plug it into my computer's or laptop's usb port.

I like that this charger is lightweight, charges batteries individually and shows color lights indicating the charging status. Mostly happy with this item. My only complaint is the micro USB connection, I'd have preferred a USB-C one instead, but it'll work.

The only way to use the charger as a battery bank is to have 4 AA Panasonic rechargable batteries inserted. What a shame. The requirement severely reduces the charger's value to the customer. IMO the price is not justified by the product's features.

Panasonic BQ-CC87AKBBA has ability to charge from usb or power brick and then be used as a battery pack. I would honestly reach for an actual Li-ion power bank before using this but its a perk. Ignore the people complaining about the need for 4xAA to use the charger as a power bank, that is simply physics and math. This charger and the NiMH batteries are perfect for my use case to run camera speedlight and other AA/AAA devices in the field. Brand new batteries reached full charge very quickly. On a Sony a6000 in continuous shooting mode/low speed, the flash fired every third shot. Test firing the speedlight there was virtually no wait time for the flash to recharge after firing or taking a single shot. I bought the charger from the Warehouse for a discount but the true bonus for me was the four free AA Eneloop batteries because someone forgot to remove theirs before returning.

Works fine, just overpriced and made extremely flimsy. Built-in sensor won't let you charge anything other than Enloop. Does what it says it does. Could literally be made by a child from a science fair. I suggest buying another brand that charges universal batteries (*ahem!* Energizer!) for $20 cheaper.

Charges my AA & AAA very well. They charge completely and works for long.

Easy to use

Very easy to use, very compact and very good look as well.

So far so good and very impressed. ENELOOP PRO made in Japan. You can't go wrong, just pay the premium, it is worth it. Sold by Amazon price is good, 6 AA for $36 CDN, 10 AAA for $41 CDN. Charger is powerbank, cool temp, using low voltage amperage to charge batteries, not like some hot ones out there. I have FENIX, DURACELL JAPAN, GOALZERO setups , this is my new.

Works very well. The USB input is awesome. I use it to charge AA's in my motorcycle tank bag while I'm driving