That's the Nissan Leaf pack which is many times larger than a hybrid pack and they are Lithium based which is cheaper and lighter than the standard Hybrid battery. The battery packs in most hybrids like the Toyota Prius and Honda Insight are less than 1k KW-H and comprised of a stack of D cells NIMH(Nickel-metal Hydride), 1.2 volts and 8 amp hrs with high discharge/recharge.
$1k for a stack of 100 D cells is well within profitable even for NIMHs. The Volt battery pack is 20 times larger and valued at over $8k and is even smaller than the Leaf battery pack!
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-Allch Chcar
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