You should get 2 recharges out of it, these things will never be 100% efficient, but then again your packs are not charging from empty either.
If you have some other need for it then I'm sure it is a useful purchase, but if Mavic is the only use then I'd just as soon spend a little less on one more Mavic pack and the DJI car charger...
I had some pretty good results with my set up... 7 Battery Cycles from 20-100% Was so good, I bought another 2 of these Battery Banks that I used. SO now I can have my 4 Mavic battery's plus a total of 14 charge cycles more ( total 18 Cycles) from the battery bank set up that I have. Each battery bank is 950 Grams and need two to run the system, or 4 if you want to carry them and literally fly all day.
Keep in mind the battery banks can bet charged with USB or 14-20 volt DC adaptor, or from a car while its running and putting out 14+ volts
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