Just got my upgraded Smatree SP90!!! This is supposed to charge up in 3.5 to 4.0 hours.  Last night I flew and discharged three batteries below 10%.  I put them on the SP90 and they all three charged simultaneously in under 55 minutes.  Then, I flew this morning and again took all three batteries below 10%. I put them on the SP90 (without recharging the unit) and again all three charged in under 55 minutes!!!  Smatree advertises 6 batteries on a single charge...I'm going to put the RC on it now and see if I can top it off before the SP90 runs out of juice.  It's much smaller than the DJI cradle and I can be flying with my fourth battery as I have three charging!!!

For reference: SP90?

Yes...on Amazon...Smatree SP90

The SP90 hardly had any charge left for RC...went from two steady whites and one flashing to three steady whites, then went dead.

Can you use the DJI adapter (included in the FMC) to charge it?  

Would you be kind to weigh this thing?

I got the Smatree powerbank half year before when I bought my Spark. It works fine but it is hard to charge six batteries and the RC, especially for the Spark batteries only with 10% power left.

Its pros are fast charging of 3 batteries at the same time and also fast charging up itself (with new version) within several hours. The cons are quite heavy, hotness during its recharging and may not start charging Spark battery if power left in the powerbank is too low. Of course, Spark battery is hot after fly and needs to wait to cool first before charging with the powerbank.

i see one of these on e bay for 24.00$ what do you think ?Legit?

Maybe...but check to see if it's the improved version...it will have a hole where the charger cord plugs in.

I don't see the one on ebay you're talking about...what search words did you use???