The time required to charge a battery pack based on its capacity (Wh, kWh, Ah, or mAh) and the charging current (A or mA). Charging Current The current supplied by the charger to charge the battery pack. Current State of Charge (SoC) The current charge level of the battery pack as a percentage.
C5A, as a standard, can be converted to a number when the rated capacity of the battery is known. The advantage of using C5A instead of “800mAh” is the addition of a specific discharge rate. This is because a battery will not deliver any arbitrary combination of current over time that adds up to the mAh rating.
Charging Time of Battery = Battery Ah ÷ Charging Current T = Ah ÷ A and Required Charging Current for battery = Battery Ah x 10% A = Ah x 10% Where, T = Time in hrs. Example: Calculate the suitable charging current in Amps and the needed charging time in hrs for a 12V, 120Ah battery. Solution: Battery Charging Current:
Under no conditions you should connect unregulated 5V to LiIon - current will be >10A and something would explode (PSU or battery). You need regulated current circuit. It sounds like what you're building is a dock that will accept multiple phones and power them all at the same time.
Supplying the phone from a 5V source that has a higher current capability will not make the battery charge any faster. If it did then you would run the risk of damaging the connector on the phone or even melting the tracks on the PCB within the phone. Small USB connectors that I have used have a contact rating of up to 1A on the power lines.
My battery capacity will be about 80-90 Ah and I plan to use discharge 20-30 Ah per cycle. I'd ideally like 1 battery recharged (30 Ah) in 2 hours max. Any help would be appreciated. Thank you. Instead of using an off the shelf car battery charger? Typically it's 2 to 10 amps, or c / 5.