
Does exactly what it says it does. Charges all 4 of my P3 batteries one at a time using the existing P3 charger. It also supports battery firmware updates. Tonight I cheered on 4 batteries and watched as they first turned each one on briefly and charged within a few seconds. It then selects the one with the highest charge and gets it to 100%, then retests all the others, charges etc. I measured with a wattmeter and it uses less than 1 watt itself. It's not cheap, but I was really tired of manually charging batteries and didn't want to buy a cheap non-DJI parallel charger or a well-made $500 charger that I saw on sale. This one is perfect for my needs. Oh, and it's smaller than I expected - easy to take with you when you travel. 5 stars for functionality, -1 star for price. I'll update this review in the future if I run into any issues or notice anything else interesting about it.