What is the capacity (Ah) of the 12V battery?
What are the capacities of the 5V batteries?
What is the chemistry of the each of the batteries?
What can I do to give it voltage little higher than 5V ?chargng a battery requires a higher voltage ( lok up battery specs) than the battery is rated for. a 7805 will give you 5 volts, your battery needs a little more to charge.
I would use the automotive cigar-lighter plug charger designed for your cell phone. It is designed to make the right charging voltage/charging current starting from a 12Vdc input. Much more efficient than using a 7805, which will waste 14W in heat to deliver 2A at 5V (10W) to the cell phone.5V battery is not actually of 5V its a cell phone Li Ion battery of 3.8V which needs 5V and 2 ampere to charge.
But i dont know about capacity of 12V battery. Its dry cell battery.
I would use the automotive cigar-lighter plug charger designed for your cell phone. It is designed to make the right charging voltage/charging current starting from a 12Vdc input. Much more efficient than using a 7805, which will waste 14W in heat to deliver 2A at 5V (10W) to the cell phone.
Does the 12V battery look like this?
Be sure to use the phone's built in charger - overcharging lithium batteries can cause "venting with flaming gas" or possibly a small explosion.5V battery is not actually of 5V its a cell phone Li Ion battery of 3.8V which needs 5V and 2 ampere to charge.
But i dont know about capacity of 12V battery. Its dry cell battery.
Buy one...Also suggest me a circuit to charge this 12V battery from 220 AC input.
Lead acid chargers can be tricky - I believe the transformers are specially wound to produce a particular current curve - the alternative is some circuitry that isn't trivial.Buy one...
by Duane Benson
by Jake Hertz
by Jake Hertz
by Jake Hertz