Charging from Dynamo: Help for M Rashid

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To charge a 6V 4.5Ah emergency light from a 12V bicycle dynamo, a voltage stabilizer is recommended to ensure the correct voltage for the built-in charger. This stabilizer should be set to the maximum input voltage required by the charger. Additionally, a series diode is necessary to prevent the battery from discharging back into the dynamo when it is not in use. Proper setup will allow for effective charging even at lower dynamo outputs. Following these guidelines will help M Rashid successfully charge the emergency light.
M Rashid
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I want to charge from dynamo (bycycle dynamo 12 volt) with emergency light 6 voft 4.5 ah. (builtin charger).

Please help me.

Thanks.

M Rashid
 
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The charging control depends on the type of cell but, as you say it has a built in charger, it should take care of all that. It seems to me that you would need a voltage stabiliser, set to the maximum input voltage that the charger / battery needs. Then you should get some current into the battery even if the dynamo output is not its maximum. To avoid the battery discharging back through when the dynamo is not turning you will probably need a series diode, too, immediately before the battery pack.
 

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