Lithium-ion batteries, when not in use, generally don't degrade significantly simply by sitting idle. The monthly SoH (State of Health) loss of a lithium-ion battery that is not undercharged, overcharged, or overheated is between 0.
No, it almost certainly won't be at 100% health. See here, for example. Oh, a primary cell. That explains the 10 years. When people read “lithium battery”, most think of lithium-ion rechargeable, so called secondary cells. Hence both mine and Cristobols comments/answers. Your battery will degrade in storage, certainly significantly in 15 years.
Lithium-ion batteries, when not in use, generally don't degrade significantly simply by sitting idle. The monthly SoH (State of Health) loss of a lithium-ion battery that is not undercharged, overcharged, or overheated is between 0.08 to 0.25%.
Emerging alternatives could be cheaper and greener. In Australia's Yarra Valley, new battery technology is helping power the country's residential buildings and commercial ventures – without using lithium. These batteries rely on sodium – an element found in table salt – and they could be another step in the quest for a truly sustainable battery.
Currently, lithium (Li) ion batteries are those typically used in EVs and the megabatteries used to store energy from renewables, and Li batteries are hard to recycle. One reason is that the most widely used methods of recycling more traditional batteries, like lead-acid batteries, don't work well with Li batteries.
Are lithium ion batteries sustainable?
While this may sound like the ideal path to sustainable power and road travel, there's one big problem. Currently, lithium (Li) ion batteries are those typically used in EVs and the megabatteries used to store energy from renewables, and Li batteries are hard to recycle.
Are batteries safe?
However, batteries are both difficult to produce at the gigawatt-hour scale and sensitive to minor manufacturing variation. As a result, the battery industry has already experienced both highly-visible safety incidents and under-the-radar reliability issues—a trend that will only worsen if left unaddressed.