I did a review of the SMA charger for the P2 batteries, it wasnt a good review, the unit didnt charge all the batteries fully, it left one at about 86%, i did contact the maker and he sent me a replacement, which was one for the P3 batteries, i contacted him again and this time he sent me a car charger for the P2, not very good at all,
I did notice though that the charging times were wholly inaccurate, in fact it can charge 2 batteries in about 90 minutes, this is great as I have 4 batteries so use the SMA for 2 of them and the other 2 get charged with 2 original DJI chargers