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:

um i think it might be a car?

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante