I trashed the stock HL batteries and charger. I already have load of RC equipment with two high end peak chargers that charge all battery types as well as an assortment of batteries. You can pick up decent 3500 mah and above nimh batteries fairly cheap these days which are a far cry better than what HL supplies. As for chargers you should always use a peak detection charge for nimh, lithium, and other types of batteries. It gives a better charge and doubles to triples your battery life. Nimh and Lithium Polymer batteries can be damaged if not using peak detection.

Anyway, enjoy the new Tank!