I purchased an ISDT k2 air about a year ago, and it has been an excellent charger. I mostly use it for 2s lipo drag packs and 4s lipo offroad packs. It is very easy to operate and well worth the price. Don't hesitate to buy ISDT products great quality and price.

Great price, fast delivery. Excellent product.

I now have two K2s. Given all the other charges out there, I bought a second one. Enough said

My two issues thus far are that it 1) does not seem to charge the batteries as fully as my other chargers and 2) leaves the packs more unbalanced than my other charges.

Observation 1) is based on the cell voltages after the charge terminates. While the cells will be 4.2 V on my other chargers, the K2 Air is leaving them at ~4.18 V. It doesn’t seem to stay at the 4.2 V plateau while ramming down the current long enough to fully charge them.

Observation 2) is based on the measured cell balance after the charge completes. The delta between the highest and lowest cells is sometimes 5-6 times more than on my other chargers. Despite having 1.5 A max balance current spec, it doesn’t seem to be using it well.

These observations are being made while charging 6S 3,600 to 5,200 mAh packs at 1C.

It’s nice to have two more channels of charging and, for the sale price I paid, I guess it’s ok.

I really love the color screen the app for your phone is really not that great all you can do is monitor it you can't do anything else with the the batteries