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Inexpensive chargers have really bad ripple, and this may actually be GOOD for a battery but bad for electronics. It's true that most car electronics are designed to survive somewhere over 16 volts but it doesn't do them a world of good. It can exponentially shorten the life of a lamp. It also may trip the OVP and blow a fuse.
The battery acts like a capacitor to smooth out the ripple, except when it's completely dead and shot, like an internal break or a dead cell. Then, the ripple goes through the rest of the car if the battery is not disconnected.
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