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Step 2The schematics
I assume anyone who wants to make this can read the schematics bellow ...
Basic principles:
NOTE:Li-Ion batteries shouldn't be discharged bellow 3V (In this circuit they are discharged to 3.3v).
Pressing the push-switch will connect the tested battery to the relay and enable it to continue working until the replay control is bellow a set threshold and will disconnect stopping any discharging.
The White LED is there to limit the voltage discharge of the battery to ~3.3V.
The orange / green / red (red should be best for a 1.5v battery operated clock / watchs) is there to supply the watch with a fairly regulated voltage to work on - the two leads from the LED connect to where a battery would normally connect.
The load is two 4.7 ohm 5W resistors in my case (but can be anything you want to discharge the battery with - don't over do it - just calculate the I =V/R to get the current and multiply this by the hours it discharged to get the Amp/Hour reading which is the capacity of the battery)
You can use an NPN transistor (which I prefer but couldn't find in my junk tonight) but connect it differently (sorry - u need to figure it out ..)
N.C stands for normally closed (when not powered it is connected to the "input" N.O stands for normally open (opposite of the other)
The arrow with the X on it is a mistake - there is no connection there.
Schematics correction : Emitter of transistor should be connected to NO and not NC!
Basic principles:
NOTE:Li-Ion batteries shouldn't be discharged bellow 3V (In this circuit they are discharged to 3.3v).
Pressing the push-switch will connect the tested battery to the relay and enable it to continue working until the replay control is bellow a set threshold and will disconnect stopping any discharging.
The White LED is there to limit the voltage discharge of the battery to ~3.3V.
The orange / green / red (red should be best for a 1.5v battery operated clock / watchs) is there to supply the watch with a fairly regulated voltage to work on - the two leads from the LED connect to where a battery would normally connect.
The load is two 4.7 ohm 5W resistors in my case (but can be anything you want to discharge the battery with - don't over do it - just calculate the I =V/R to get the current and multiply this by the hours it discharged to get the Amp/Hour reading which is the capacity of the battery)
You can use an NPN transistor (which I prefer but couldn't find in my junk tonight) but connect it differently (sorry - u need to figure it out ..)
N.C stands for normally closed (when not powered it is connected to the "input" N.O stands for normally open (opposite of the other)
The arrow with the X on it is a mistake - there is no connection there.
Schematics correction : Emitter of transistor should be connected to NO and not NC!
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