Researchers in India have developed a tool that can estimate the remaining useful life of an otherwise obsolete laptop computer based on quality grading of two of its main components—hard drive and rechargeable lithium-ion battery.Researchers in India have developed a tool that can estimate the remaining useful life of an otherwise obsolete laptop computer based on quality grading of two of its main components—hard drive and rechargeable lithium-ion battery.Hardware[#item_full_content]