Buy a hump pack with the highest mah rating you can find. I had the same problem when I got my warhead. If your good with a soldering iron build your own and mount it outside the battery box. I went to walmart and bought the highest nimh duracels and solder 5 together. You make it look like an oversized hump pack but it lasts. Use solder past and some wire. I cut the red end off an old battery pack. Make sure you get the polarity correct. I used my hump pack charger to recharge it. If you don't want to build one ebay for the best prices for hump packs and charger combos.