Electronics > Beginners
Figuring out charge circuit by watching mA draw from Lion batt charger
Beamin:
I have an e-cigarette plugged into a CC power supply that shows current draw. When you recharge it, it pulls 0.666mA (CC set to 2.5 amps) until the very end where it stops dropping and the draw goes down 0.001mA per second. That's when the battery is going into constant voltage mode? What's also interesting is when you puff on it the current spikes to .685 for a second then back to .666 then immediately after you release the switch it goes to .685 for a minute. Is this the circuitry inside realizing that if you try to use it while plugged in it will pull too many mA and it switches the heating element to the battery?
Since we are talking about Lion. I once had a blue tooth speaker with a dead battery. I replaced the battery with a slightly bigger one and tried to make it work. The new battery wouldn't charge it would power on but not charge. The new batt was a new in box replacement battery for a digital camera that I got for 2.00$ clearance that hadn't been charged/ ever used for a few years. Does the charge circuitry know it's a different battery? The difference was maybe 600mA to 800mA for the new battery. I believe the new battery showed 4.3 volts or what ever it was supposed to show so not past the point of no return.
I miss the day of NiCd where you just put power to them and they wouldn't blow up.
paulca:
It depends on the ecig, but the charger for it (or internal if USB charging) will typically charge at something less than 1 Amp. This is the constant current phase. So on a single cell if the voltage required for the cell to take 0.666Amps is less than the max cell voltage of 4.2V then it will current limit by holding the voltage back.
When the cell hits 4.2V to sustain the 0.666Amps then the current will start to fall back and 4.2V will be held. Eventually the current will drop off towards zero when it will end the charge.
As to "pass through vaping", ie. using it while charging, some will just pull from the cell while it's charging, so if you consume more than the charge current of 0.666amps it will go back into charge mode briefly to replace the current you used.
Beamin:
One puff takes an average of 80 seconds charge time off USB power supply. Interesting to figure out how many puffs you get per charge.
ebastler:
Don't suck on it, take it apaaht!
Instructive, and better for your health too... :-+
Beamin:
--- Quote from: ebastler on June 05, 2018, 07:26:27 pm ---Don't suck on it, take it apaaht!
Instructive, and better for your health too... :-+
--- End quote ---
Unfortunately to do that you have to destroy it as its all sealed/glued together.
Inside would it use a pic (some binary number like 32) micro controller ? Doesn't every modern "smart" device use the same or similar micro controller? Be it a microwave timer, washing machine control panel, ecig, etc? I bought a clock that used analog gauges and in the instructions they said it has a USB port where you can make it into anything you want kind of like an Arduino. Is this how everything will work in the future making trouble shooting as easy as taping into the data lines on the chip?
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