I've mostly been using 500 mAh to 2650 mAh 3S & 4S lipo batteries. My kids recently got some RC cars with 4000 and 5000 mAh 2S batteries. I have a few of these DC-4S 1-1.5 mAh battery chargers from Hobby King and they can charge 2S, 3S, and 4S batteries but the larger batteries take forever to charge. Are there any suggestions on a good charger for larger batteries? I'd like something that has about a 5 or 6 amp output so I can charge the batteries in about an hour or so.