Panasonic BQ-CC87AKBBA eneloop pro Advanced Individual Battery Charger with Portable Charging Technology, Black

So far so good and very impressed.ENELOOP PRO made in Japan.You can't go wrong, just pay the premium, itis 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 amperageto charge batteries, not like some hot ones out there.I have FENIX, DURACELL JAPAN, GOALZERO setups , this is my new.

I'm glad Panasonic make this product. I have a small cabin solar system that incorporates USB-C power ports. This unit allows me to charge batteries without having to fire up the inverter, which I'd have to do to use an AC powered battery charger.

Easy to use

Mais le BQ-CC17 serait plus bienveillant avec les AA et AAA Eneloop.J'adore le chargement USB et laisser 4 Eneloop Pro AA dedans permet de devenir une power bank. Mais ça reste du NiMH, alors poids/capacité c'est loin du lithium.Donc sécuritaires, comme le LiFePO4, et pratique car ce power bank devient 4 AA pour les GPS, les lampes de poche, etc,

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.