2001-2009 Toyota Prius HV Battery pack. we highly recommend to upgrade your 2001-2003 Toyota Prius battery to the second generation of Toyota Prius battery cells.
The first sign that the Toyota Prius battery pack is starting to weaken is when the fuel economy deteriorates. As the electric motor’s contribution Toyota Prius hybrid battery to power at speeds above EV mode, for the Hybrid battery repair additional power required to maintain the speed asked for is provided by the engine. Therefore fuel consumption increases.
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Toyota Prius Transmission