I like being able to charge everything at once. However, it’s loud. Don’t keep it In a common area in your house. Also the power inverter between the battery bank and the wall plug sounds like someone threw a goose in a blender. The fan failed

EDIT: IMPORTANT NOTE... When I wrote the original review I had only used it in the "charge" mode. When I went to discharge the batteries for storage I thought I had a defective unit as the batteries would not discharge, even if left overnight. OPERATOR IGNORANCE AND ERROR... BUT SNEAKY FINE PRINT IN THE INSTRUCTIONS. What I came to learn is that, unlike most batteries, THE Mavic 2 BATTERIES *THEMSELVES* TURN ON AND OFF! When attempting to use the Hanatora unit to discharge the batteries ***you must turn them on***, just as if you were powering on your drone! The instructions are in the fine print in the teeny instruction manual that comes with the unit.Something that most don't know before buying is that DJI's batteries should not be stored fully charged long term. They can be set (programmed) to auto-discharge after a specified period, but you need to do that through your Flight Controller and app, one at a time, and then they will discharge as programmed. And, you might already know that DJI's charger, while it will HOLD 4 batteries at a time, it only charges one at a time? Not the Hanotora...The Hanotora charger is a 6amp output and can charge two batteries simultaneously at full 16v 3amp charges. If you hang more than 2 batteries on it they charge simulatneously, but share the 6 amps distributed evenly between the, but simulatneously. But if you have 3 batteries and some DJI charger, you can charge 3 batteries simultaneously at full power and be up and running in minutes rather than hours. Additionally, it has an LED readout so you know exactly what the charger is doing.And I'm told that you should completely discharge and recharge these batteries after approximately 20 cycles. I'm not sure how true that is, but this charger can do that while the batteries themselves will only discharge to 40% to 50%. And then it has a mode where it will take your batteries down to that level so you can have them in long terms storage...and then when you're ready to fly you can get fully charged quickly.I didn't *need* this charger as the DJI 4 bank charger I got with the fly more kit is fine. But the Hanatora can do so much more with out breaking the bank.

At this price point I was very skeptical of this charger. When it arrived I was pleasantly surprised. It appears to be solidly built, and very nicely packaged and protected. I have 5 flight batteries, I immediately loaded it up with four of them and set it on a charge simultaneously. Flawless operation! The operation of the unit is very straightforward and simple. Additionally it has discharge and storage features. Coming from the FPV racing drone side I know how critically important to the life of a battery this is. It is great to have direct control over this especially considering how expensive these batteries are. If you know your going to store for a while you can immediately put them in that state.A note about the cigarette charger. The manuals state that this pulls a max of 10 amps. I drive a Lexus SUV. The cigarette fuse is 8 amps. That's likely going to be a problem, however this charger actually will signal if its getting low amperage. The manual states that it will charge 1 at a time if voltage is low. Or... Get a cheap inverter and hook it up to your battery.....I highly reccomend!

We cannot buy over here [UK] yet and it sounded to be a really usefull product so I stumped up for international shipping and off I went. Firstly it was delivered within 5 days [awesome] next it really does the job well in all aspects. Yes its a little noisy but who charges these things in the bedroom, mine is in my man cave so its not a problem. Only minor gripe is that you have to unplug the whole thing to turn off. Otherwise its brilliant and well worth the money. Come on Amazon get it stocked in the UK- yes its got and American plug but the fitting to the transformer is exactly the ame as lots of computers nad other electrical products.

My background is in electronics, this review will be "gently" technical. This is more than just a great charger, it has 3 important and discreet modes:1) charge with cell balance2) storage with cell balance3) full discharge to zero volts1) Charging: Plug in up to 4 batteries and they will all charge. Note that when charging 4 batteries, station 4 will initially not charge at a 2 to 3 amp rate as do stations 1 - 3. This is due to max power considerations. As soon as the 1-3 receive a significant charge, station 4 will start to catch up. At about 99% charge, the finish charge will be low current to balance the cells (the battery can be removed at this point if needed.2) you can plug in your discharged or charged batteries and depending on their individual state, they will be discharged down, or charged up, to 15.4 to 15.8 volts for long term storage. Storing at this charge level prolongs battery life and should be considered if you won't be flying your drone for a few days or more. Storing lithium batteries fully charged stressed them, so this is a useful feature. This is also why Mavic 2 batteries (and probably others) are programmed to initiate a slow self discharge when stored in a charged condition for a set number of days (I believe the default is 10 days, I changed mine to 5 days). But really, it's better not to store them fully charged for any appreciable length of time if it can be avoided - - overnight for flying next morning, no problem. But if flying late morning, then this charger makes it quick and easy to charge 'em all while having breakfast!3) Another feature is discharge mode . The will discharge a fully or partially charged battery down to zero (0%) which is recommended after every 20 or so charge-discharge cycles for maximum battery longevity.Note that when using the car charging cord, the vehicle's engine will need to be running before plugging in the charger. Otherwise, due to the high current demand, the charger's input voltage will be too low and you will get an error indication on the display..Noise: Not objectionably at all. Both the AC power adapter and the charging cradle have small muffin style cooling fans to dissipate heat, a necessary design feature when charging with this much power. BTW, no smell noted.All in all, a reasonably priced and far more convenient upgrade compared to the DJI provided charger.Minor cons (communicated to mfg): Add an on/off rocker switch on AC power adapter so one does not have to unplug cord between uses.Add a bit more length to the DC (car charger) cord. Note that due to fairly high current demand, wiring loss (voltage drop across wiring) can be an issue - that's the reason they kept the cord fairly short. As a result, on some vehicles, this leaves no convenient place or rest the charger with batteries - especially when driving (and who wants to sit parked with engine running for an hour to charge batteries?). They could increase wire thickness and add a foot or so to the length with no net loss.I'm very happy with this charger.