What does it mean to be a fully charged ion?

I think that this is the answer

Full charge is reached when the current decreases to between 3 and 5 percent of the Ah rating. Figure 1: Charge stages of lithium-ion. Li-ion is fully charged when the current drops to a set level. In lieu of trickle charge, some chargers apply a topping charge when the voltage drops.

Explanation:

fe 55.85 g/mol and h2o 18.02 g/mol.

lol for the pointsss