New Economy Receiver Kit Features Stock Traxxas receiver box, 5 killer 1500Mah Nimh cells, new switch with built in charging jack. Never have to remove the pack to recharge them. Just plug charger into charging jack and charge . Should get a good 8 to 10 tanks before needing to recharge. Order with or without the overnight charger (works for your TX batteries too) by selecting from the drop down menu.