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  • Cell phone charger from an old 9V battery

    i have 2500 mah battery in my phn what if i made this charger for how much time the battery can charge my phn and how many times a 9v battery can charge my phn

    i have 2500 mah battery in my phn what if i made this charger for how much time the battery can charge my phn and how many times a 9v battery can charge my phn

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