Hi Folks
just seen this on Amazon Uk
https://www.amazon.co.uk/Car-Cha ... dji+spark+batteries
and was wondering if anyone has any info it, Ie does it work , and do batteries behave after using this accesorie
,...Thanks in advance

It looks really convenience. I wonder the feedback,too.

I bought it, threw it in the car, never used it yet.
I also have one for my Phantom 4.  
Didn't think to test them, just there for emergency, but I rarely fly more than the current batteries charged.

Not sure myself, it only looks like 2.5A, IIRC the standard USB charger is 3A, so I guess would take longer than stated to charge? Appears a bit cheap for a piece of electrical equipment for this purpose too.