Trickle Charger

Trickle Charger Calculation This simple trickle charger is just a power supply, in series with a resistor, in series with battery to be charged Charging at 1/10 the AH rating of the battery is safe for all NIMH and NICAD cells, can be left connected permanently May take 7-10 hours to charge a depleated cell Enter these values Power Supply Voltage Voltage of Battery AH Rating of Battery

12 <== Volts 1.2 <== Volts (fully charged voltage rating of battery) 2 <== Amps (i.e. a 2000 mah battery is 2 amps)

Outputs Trickle Charge Current Voltage Difference Value of Resistor Power Rating Of Resistor

0.2 Amps (This is 1/10 the AH rating of battery, this value is "safe" for all cells) 10.8 Volts (This is the voltage across resistor, must be positive) 54 Ohms (R= E / I) 2.16 Watts (P= E * I)

Note: If you have some power resistors in your junk box and a variable supply, just hook up and vary supply for the current

o be charged nnected permanently

s "safe" for all cells)

vary supply for the current needed