The charging current of the battery will decrease, and the battery charging current will decrease as it approaches full capacity until the battery is fully charged. Another is that there is no harm in charging a fully charged battery because the current will be very small.
So twice the power for half the time is the same amount of energy drained from your battery. EDIT: If the question is why would the battery capacity decrease over the expected ideal, then Brian's comment is the answer. The internal battery impedance means more power dissipation at higher currents.
As a result the life of the battery decerases (Mostly for primary cell batteries) Yes, twice the current discharge means half the time to battery depletion in the ideal case. The capacity (at least to a first order) is the same in both cases. A battery's capacity is the energy stored, measured in amp hours, ergs, joules, or whatever unit you like.
Basically, A battery voltage is maintained at 4.2V, the charging current gradually decreases, and the charging speed becomes slower. This stage is mainly to ensure that the battery is fully charged.The battery is fully charged when the charging current is lower than 0.1C or 0.05C.
This means that the current should be no more than half the rated capacity of the battery. So for example, if you are using a 54 Ah battery, the charge current should be no more than 14A. Using too high a current can cause damage to the cells and reduce the life of the battery
After battery is 100% charged, it reaches a voltage level that it is not able to store energy. Then, the current injected into the LA battery is used to electrolyze the water in the solution, generating hydrogen and oxygen gases - known as gassing, and depleting the electrolyte level.
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