How to make your own universal charger,
One output AC 12V5-15A AC transformer, 6-10A high power rectifier diode 1, 25V2200uf capacitor tube 1, low voltage power control switch 1, 220V power plug 1
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First of all, the transformer output is alternating current must not be directly used to charge! Must be rectified first! The simplest is half wave rectification!
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Secondly, the maximum charging voltage of the 12-V battery is 14.8V! So 16.5V voltage can not be charged directly, the battery damage is larger! So the pressure should be reduced! You can also use the rectifier diode to achieve!
The cost of self-production is too high, and now many of the eliminated (original, voltage stable) mobile phone chargers are refitted for universal charging.