Discussion
The chief advantage of the lead acid battery is its
Answer: A
Correct answer: low cost per unit of energy
Lead acid remains the cheapest practical rechargeable chemistry per kilowatt hour, and its materials are abundant and almost entirely recycled. Everything else about it is inferior to lithium ion: it is heavy, its cycle life is short if it is deeply discharged, and it deteriorates if left standing discharged. Cost is what keeps it in service for standby and starting duties.
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