K4 Dual Lipo Battery Charger Discharger 1~8S RC Battery Charger AC 400W DC 600Wx2 for Life,Lilon/Hv,Pb,NiMH/Cd Battery Balance Charger Smart Charger

Great unit charges anything you throw at it without a hiccups. The name speaks for itself, a bit on the higher side of prices but quality is not cheap.

Best Charger for the Money! I bought two of these, and I absolutely love them! They charge my 6-cell lithium polymer (LiPo) 6000mAh packs with no issues. Each bank can charge at 6 amps, and it handles both packs simultaneously without a hitch. With 200 watts per bank and a built-in 400-watt total power supply, this charger delivers solid performance and reliability. Highly recommended for serious RC enthusiasts!

This is a very good charger and will do high capacity large batteries. Well built and internal power supply helps with set up. Very easy to use.

For those complaining about the Bluetooth who really cares you don't need Bluetooth at all it's kind of pointless using your phone with Bluetooth just makes things more complicated does charger itself is great it's easy to use it's never having an issue and the fans shut off correctly the screens nice the buttons are nice it's a really quality charger so far

This is my initial impression. I may update this review soon. I really like this unit! The overall charging is solid. This is the best of all my AC and DC, ISDT chargers, so far - with one calibration gripe. The protective and nice box that this comes in was oddly shipped in a thin plastic Amz bag - terrible of Amazon/ISDT. This is not what I expect from ISDT considering the mass of the charger with the built in A/C power supply, and the associated price tag. The charger works well. I have nothing bad to say about it, except for the following: With my unit, cell #1 is always measured to be 0.02v low, so it in turn always gets over-charged/balanced by 0.02v. This is not a huge deal, but the other 3 cells are measured at the same V - some of us check before and after each flight. I have confirmed this with many different batteries, cables and meters. I will be exchanging this unit. That #1 cell always being read low, and then is over charged irks me. I'll assume my unit's issue is a 1-off. The packaging in the nice box but then in a thin plastic bag, better not be the norm. I will try another one, but I will also be trying the P30 unit, which is a DC-only unit with Bluetooth. Let's see how that one turns out. I may update soon if anything changes, good or bad.

I have used many different chargers over the years and this replaces all of them and all the power supplies needed to use them. It is very simple to use and seems to be higher quality than any charger I have ever used.

I am not sure if I am going to keep this charger. It charges batteries, sure. For $230, I expected all the bells and whistles to be fully functional. They are not, and the programming of the device has some to be desired. The app connectivity is nice, but it only shows the current status of the current charging cycle. There is no way to actually interface with the device to make any changes or even to look at the current configuration of the device. Bluetooth connectivity seems to not work, and the app shows an error when I attempt to check or update the firmware on the device. I went to ISDTs web site and downloaded their updater PC app, but it does not recognize the K4. The info shown on the firmware page does not show a date, so I don't know if the firmware is up to date or not. The display also needs some work. I like to see the capacity percentage of each cell, and this charger does not allow that. It only shows voltage, and I have no desire to attempt to do the math in my head (and I shouldn't have to). Worse, when you plug the battery in, the charger ONLY shows the voltage. It does not show the percentage of the pack AT ALL until charging starts. If you want to see the available charge in a pack before charging you are required to use an external meter. This is RIDICULOUS. A charger that just charges batteries well is fine, but not at $230. The Three-Stars I gave are because this needs more functionality to justify its price. NOTE: I emailed ISDT about these issues last night but I have not heard back yet. If I do hear back, I will update this review. They are going to lose another star if they don't get back to me.

This is the best charger I have ever had. It has multiple modes and it charges super fast. I'm really happy with it as I use it to charge all my lipo batteries either at home and out on the field when flying.

Top notch charger. Performs as stated/expected. Fast shipping with Amazon.