Battery Charger

How can I make a 7 volt battery(two cell phone battery in series) charger, which is indicate "charging" & "full charge" condition by led & stop charging when charge is full. PLEASE HELP ME...

hi

Please find the below link.

http://www.eleccircuit.com/simple-auto-cut-off-12v-battery-charger/

The simplest type of circuit charges the battery very slowly (24 hours) and you don't need to remove the charger. However you simple connect the battery and remove it tomorrow.

All the other circuits are very complex.

1 pl mention the voltage rating and current rating of the battery.
2 what is your load current &voltage; requirement.
3 mention for what purpose you are using this circuit

Hi,Narottam gupta,
Make a bridge rectifier and supply 12v dc to the in put of 7805 ic, connect a 470 E half watt resistor from the out put pin 3 to the the centre pin 2 now connect a pre set 500E fr pin 2 to ground ,provide a 10 mfd 63v cap on the out put terminal of the ic to ground ie negative of the power supply, now vary the pre set to get 10.3v at the out put of the ic.

now connect 3 rectifier diodes in4007 series to the out put of pin 3 of ic all anode of diode facing towards to the ic pin 3 on the last diode connect a 82 ohms 2 watt in series and connect the other end to the +ive of the battery and connect the _ive to the negative of the power supply ,also connect a red led anode on pin 3 of ic and a resistor 1/4 watt 120 ohms in series with the led and connect the other end of the resistor to the cathode of the last diode now your charger is ready .during charging the led will glow when charging is over the led stops glowing, make sure you put 2 no 3.7v1020mah batteries in series. Regards sambath.