Here is the circuit diagram
 of a low cost  charger for 6 volt batteries. This circuit requires a 
regulated 10V-DC front end capable of supplying 2 Amps. Begins the 
charge period at 240mA and at full charge switches automatically to a 
float condition of 12mA. The capacitors should be the electrolytic  25V or greater.
Skema Rangkaian Charger aki 6 Volt
Switching
 transistor T1 is an TIP31C NPN transistor, Si-Power Output/SW, with a 
TO-220 case and can be changed by using a appropriate substitute such as
 the NTE291, ECG291, etc. Timer/Oscillator U1 is a 8-pin NE555V and can 
be changed with a NTE955M or ECG955M. Resistors R4, R5, R6, and R7 are 1% metal film types. 
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