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Simulation not stable. Might crash your phone.
Resurrecting a dead car battery may not be always possible, but when it is, it is a tricky process. First of all, you need to charge a dead battery with a tickle current - indeed a very small amount of current. For the more impatient ones, I've made the circuit work up to 3A, but you can substitute the only 3.3k resistor with a potentiometer and control the maximum current yourself. The current control should from from a few mA to 3A. Increasing the 3.3k resistor to 5.6k should increase the current to 5A. There is also a circuit to disengage the fully charged battery, and re-engage it if it is discharged. Basically the circuit automatically senses if you plug a dead battery into it and disengages it when it is charged. The LED will indicate a fully charged battery, although EC crashes when it is wired into the circuit, so I added a switch to trick the simulation. I've also added an optional 50ohm resistor for deep recovery, if you choose to leave the battery for a few days do undergo several slow charge/discharge cycles to bring it up to life. You can omit it or increase the value exponentially if you choose to go with only one cycle.
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