I opened the Yuneec charger and soldered the leads onto the existing adaptor within the box. The photo shows the charge half-way through. Charging at about 90 mAh per minute. Assuming 20% left in the battery, that's about 40 minutes for a full charge. The battery at full charge was barely warm. I could speed things up by using 2C and requiring about 17 amps. The Polaron can give 25 amps, so that is well within capabilities. To do a quicker charge, you will need a good charger. The charger shown in the photo costs £350 €420 $460 The charging time is dependent on the amount of amps available. If you make this modification to the Yuneec H charger, then you must not connect the modified charger to the Yuneec supplied power adaptor.