SRB Quark battery adapter
I have adapters that allow you to use aftermarket batteries with a JST connector in your Quark. They are $5 for one and $9 for two, shipped CONUS; $6 and $11 shipped anywhere else in the world. I've been making these for my Quark friends at RCG for some time (I've sold 50, so far) and thought I'd extend the offer to the Quark fliers here at RCU.