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Hi,

I tried searching for this for quite sometime now and haven't read any suitable answer (or perhaps it was already answered, I just didn't get it). I'm guessing this is a pretty stupid question, but here it goes: would it be alright if I use a 9v battery to power Arduino and then have that same battery connected in parallel to a battery charger?

The project I'm working on is a typical home automation project where the arduino is connected to a relay board and the board connected to a light bulb. What I'm thinking is that I power the arduino with the 9v battery while its turned off, and then when it is on (in a predetermined time via arduino) powers a smart charger which then charges the battery and powers the arduino. Is that feasible?

Thanks!
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Quote
Is that feasible?
Yes.
What is the charger like with a battery across it but with no power on the input?
You might have to put a diode between the charger and the battery to ensure nothing happens in that situation, but then again you might not it depends on the battery charger.
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Thanks for the quick response! One last thing, how can I test if the charger is doing anything while it's off? Can I simply use my multimeter and check if it draws any current? And can I do the same thing to check if the charger is indeed switching off if the battery is fully charged?
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Yes put the multimeter in series with the charger to see current flowing in and out.
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