Because the material in the degrades over time. To minimize this, you also should only store them at I believe 60% capacity when you know you don’t need them. When kept fully charged they will lose capacity faster.
But when you compare them to let’s say a gel, AGM or car battery, you can use 80% capacity of a lithium battery but only 50% of the AGM or car battery. The lithium ones are also lighter, so overall they have a higher usable capacity with lighter weight.
Latest Answers