The charger is full of automatic power off principle: this does not need accessories, this is the phone comes with, now have anti-overcharge protection measures, after full charge will automatically power off.
Now battery manufacturers in order to prevent the battery from overcharging are designed inside the battery \"charge and discharge protection circuit\". The work of this protection is mainly to monitor the battery voltage, when the voltage reaches the limit value, that is, activate the overcharge protection, at this time the charge control will automatically disconnect and stop charging.
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Of course, there is a saying that when the battery is full, the battery and the power supply form a loop, so that it will not continue to charge.
Here you need a charger timing protector, automatic circuit breaker
1, want to allow the 12V charger to fully charge the battery to achieve automatic power off, you can add a charging voltage detection circuit to the battery, when the battery is fully charged, the detection circuit output a control signal to cut off the charging circuit, so as to achieve full automatic power off.
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2, the battery charger generally uses imported power modules, is a novel electronic circuit intelligent automatic charger. Low loss, high efficiency. Suitable for 12V, 24V battery charging, the charger also has anti-reverse connection function.