usb charger

Hi. I'm new to the forum and searched for this query with no luck so apologies if this is already asked somewhere else. Like alot of people I am interested in being able to charge a spark battery of a power bank while flying the spark. I have found the following and wondered if anyone has any...

Hi All... I'm new to Spark and I'm wondering if is ok to charge the batteriers using the usb charger that I use on my car to charge my cellphone... I browsed a while on google but I couldn't find an answer... Thanks in advance and have a nice fly :)