It is also noticed that charging the battery with the smallest charging current of 0.5A for 600minutes (10 hrs), the very presumable 5Ah capacity is stored in the battery. The voltage of the battery slowly but steadily increased from open circuit voltage throughout the long charge time to a value of 12.05 V.
Charging can also take place at constant voltage. The initial current here is usually higher and can damage the battery. The two inconveniences brought by this charging method are that, float currents sometimes destroy the battery and also that it is more complicated to estimate the amount of energy stored using this method .
It was then inferred from this work that the very long time required to charge batteries at lower rates is not only due to the smallness of the magnitude of the current per say but due to the fact that at such low currents, the charging process is ineffective.
During a single charge process, as the battery gains energy, the voltage rises. This rate of increase in the voltage decreases as the battery charges up.
At higher constant charging current rates the battery charges more effectively and this does not only apply to the Vanbo Battery (battery Sample 01) that was tested before but it was also true for the Winbright battery (battery sample 02) tested too.
There are four predominantly used methods to charge batteries: Batteries can be charged at constant current but the charging current is supposed to be as small as possible to avoid destroying the battery. This is because uncontrollably high current rates induce gassing in the lead acid battery. Gassing causes the continuous loss of electrolyte.
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