Thunder power Does make a battery for the 600. YOu can also combine 2 11.2 V 3S batteries to get the same battery. YOu just need to make the appropriate Y harness with deans connectors. Making them this way will save you from getting another charger if you haven't already bought one for that big align battery. 2ndly, you can use them for other smaller applications, and 3rdly, if you wreck your big pack, you're out the entire pack. If you wreck a cell or two in the 2X setup, you might get away with only having to replace one of the packs.