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Is it possible to restore dead li-ion 18650 batteries from a laptop battery? Is the degradation of lithium-ion batteries reversible and is it possible to somehow revive degraded batteries. Using a dead laptop battery as an example, we experiment with 18650 banks, revive and restore completely discharged banks without special expensive equipment. Restoring a li-ion battery is sometimes possible, but sometimes not - it all depends on the degree of degradation. In general, how to restore a lithium-ion battery after a deep discharge and is it worth trying to restore at all.