Ok , I can pretty much make circuits to recharge a rechargeable battery but I want to beable to make a rechargeable circuit for batteries which indicates when the battery is 50% , 75% , 100% charged.... (using different color LED's)
Right now I have to mathematically approximate the time it takes for a battery to be charged... I do this by the mAH and the rate at which the circuit is charging the battery ... this is only an approximation and usually it is not linearly charge so I let it go for any extra hour or so to be sure... (their must be a better way of getting more exact since what happens if I couldn't find out the mAH ratings then what ?)
I would like a way on how to determine when it is fully recharged and when it is 50 , 75 , ...etc % charged...
Don't know how to do it with a circuit but first I would just like to understand how I would determine this mathematically before think on how to rig up a circuit for it (don't want to copy a schematic anybody can do this)....
Question when a battery is fully charged will current stop flowing in my circuit ... or could it possible keep charging until it explodes the battery ....
I am using a 9volt to charge a 9volt rechargeable battery so I am assuming once the 9volt battery is fully charged the KVL would imply the voltages would cancel each other out and no current would flow because no net work is being done at this point....?
Input would be great since I am just learning about rechargeing batteries
I am alittle shaky on using a source that is alittle higher voltage then the thing being charged since I would think the KVL would imply if I used a 10volt source to charge a 9volt battery we would have an extra volt being drop somewhere else ..... Maybe somewhere inside the battery potential damaging it ....duno...
Thanks again
Right now I have to mathematically approximate the time it takes for a battery to be charged... I do this by the mAH and the rate at which the circuit is charging the battery ... this is only an approximation and usually it is not linearly charge so I let it go for any extra hour or so to be sure... (their must be a better way of getting more exact since what happens if I couldn't find out the mAH ratings then what ?)
I would like a way on how to determine when it is fully recharged and when it is 50 , 75 , ...etc % charged...
Don't know how to do it with a circuit but first I would just like to understand how I would determine this mathematically before think on how to rig up a circuit for it (don't want to copy a schematic anybody can do this)....
Question when a battery is fully charged will current stop flowing in my circuit ... or could it possible keep charging until it explodes the battery ....
I am using a 9volt to charge a 9volt rechargeable battery so I am assuming once the 9volt battery is fully charged the KVL would imply the voltages would cancel each other out and no current would flow because no net work is being done at this point....?
Input would be great since I am just learning about rechargeing batteries
I am alittle shaky on using a source that is alittle higher voltage then the thing being charged since I would think the KVL would imply if I used a 10volt source to charge a 9volt battery we would have an extra volt being drop somewhere else ..... Maybe somewhere inside the battery potential damaging it ....duno...
Thanks again
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