The cost of the battery is only ~10-20% higher than the bill of materials â suggesting a potential long-term competitive price for Lithium Ion batteries could approach ~$100 per kWh. Tesla currently pays Panasonic $180/kW for their batteries, although conventional systems still selling for $500-700/kWh.he cost of the battery is only ~10-20% higher than the bill of materials â suggesting a potential long-term competitive price for lithium-ion batteries could approach ~$100 per kWh.
n, pl -nies. 1. a declaration of truth or fact. 2. (Law) law evidence given by a witness, esp orally in court under oath or affirmation. 3. evidence testifying to something: her success was a testimony to her good luck.
2. (when: intr, usually foll by to) to witness (an act, event, etc) or bear witness to (an act, event, etc) as by signature or oath. 3. (tr) to make evident; demonstrate: his life of luxury attests his wealth. 4. (tr) to provide evidence for: the marks in the ground attested the presence of a fossil. [C16: from Latin attestÄrÄ« to prove, from testÄrÄ« to bear witness, from testis a witness] atËtestable adj.