how can i charge a 4v lead acid battery with usb cable???+~- or+~+
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simply u need to use a resistor as per current given to reduce voltage to 4v.ucb has 2 end points as +&-.just connect it to battery points .
charge for 2 mins. as current given is high it will be charged fast.
charge for 2 mins. as current given is high it will be charged fast.
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