I purchased the Spark for it's portability. I stick it in my suitcase when I travel. What I'd really love would be a cable that can go from the stock charger directly to the
battery so that I could charge my 2nd
battery while flying the Spark with the first
battery.
The stock charger says it will output 5V at 3A, 9V at 2A, and 12V at 1.5A. The
batteries are 11.4V. So it would require at least 12V to charge them. Obviously they will not charge from a regular 5V USB charger.
I've seen chargers on Amazon that will charge several
batteries and the remote at the same time. They have ports that look to be USB ports and cables from those ports directly to the
batteries. The issue is those chargers are huge. Even the stock 3 port charging hub is more than I'd like to carry.
I'd love to just carry a cable that goes from the stock charger to a
battery. that would be very compact and light.