Li-ion based chemistry
A Li-ion based battery is normally well above 95% state of charge (SOC) when the bulk charge stage is completed.
The bulk stage duration Tbulk can be calculated as Tbulk = Ah / I, where I is the charge current (excluding any loads) and Ah is the depleted battery capacity below 95% SOC.
The absorption stage duration Tabs required to reach 100% SOC is typically less than 30 minutes.
For example, the charge time of a fully discharged 100Ah battery when charged with a 10A charger to approximately 95% SOC is Tbulk = 100 x 95% / 10 = 9.5 hours.
For example, the time required to recharge a fully discharged Li-ion based 100Ah battery with a 10A charger would be approximately:
Bulk stage duration, Tbulk = 100Ah x 95% / 10A = 9.5 hours
Absorption stage duration, Tabs = 0.5 hours
Total charge duration, Ttotal = Tbulk + Tabs = 9.5 + 0.5 = 10 hours