I spent some money and got a lithium battery. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
It is expensive, but weighs nothing and comes with a battery charger.
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Hawk 250 
Lithium Battery, Mikuni Carb 110 main jet, Bark Busters with Mirrors, Extended Mixture Screw, 428 O-ring Chain, 17-15/40 sprockets, Digital Cluster, Cycra YZ250F Skid Plate, Oil Cooler
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