I was about to send this back because it keep making my Air 3S batteries throw a 3 blink error code on the third LED indicating input over voltage. I would happen to just one battery out of three installed in the charger and would change to different batteries in different slots. It was seemingly random even if I had two 100w chargers plugged in 1 battery would always blink the error. I saw a few other references to updating the firmware but none of them said it was the chargers firmware that needed updated instead of your batteries. I mistakenly updated all my batteries (install battery in drone, fire it up, and go into your controller and select update firmware with each battery). If you don't want to update your base controller or drone firmware you can't update your batteries. But it's not necessary and did not fix the issue anyway. You need to update the firmware in the charger.To fix this you need to install the Ploying app and connect to your charger via bluetooth and update the firmware. After this the charger works great charging all three batteries at once as long as you have two 100w chargers plugged in.with only one 100w charger plugged in it will only charge two batteries at once at about 50w each. Anything less than a 100w charger will only charge a single battery at a time. Anything less than 45w and it won't charge at all.As pictured the charger shows you how many watts is being pulled from each charge port with the charge status of each battery. This includes individual cell voltage, wattage going to each batt, batt temperature, and number of charge cycles on each batter.The charger can be changed between storage mode, 95% fast charge, and 100% fast charge. If you use the Polying app there is an additional 98% fast charge mode not available in the hardware menu.So far it's a great upgrade over the stock DJI charger because it is a bit smaller, lighter, give you your battery health information, allows you to charge 3 batts at once, and gives you the option of doing a storage charge.If it holds up it will be great!