But while you gain a little bit of charge from the battery, getting to a full charge this way is not the most practical (and safest) solution if you have available power. What you can get from a 9-volt battery can be enough to call 911, text your parents, or ask for emergency assistance. While a typical 9-volt battery only has 500 milliAmpere hours (mAh), most cell phones now need thousands of mAh to be fully charged.įor instance, an iPhone 7 needs about 1,960 mAh, and a Samsung Galaxy S8 or S9 will be fully charged with as much as 3,000 mAh. You can use a piece of aluminum foil to keep these parts in place. If any parts aren’t connected the right way, it won’t work. You want to make sure that everything is well-connected – the spring should be touching the car charger’s nub, with the car charger button pressed in. Hold it in place for a few minutes, and voila! Your iPhone or Android is charged. Place your 9-volt battery in such a way that the big negative terminal is on the spring, while the smaller positive terminal is on the car charger. You can use a metal pen spring to tape the metal nub on the side of the charger, or a key to activate the charger. You have to use a car charger – the one you plug into the cigarette lighter in any car. How to Charge Your Phone Using a 9-Volt Battery This feature is particularly useful in cases where you have no viable power source, like when you’re stuck in a storm or any other emergency situation. Good news not only for smartphone users, but also for businesses that sell cell phones - you can use a 9-volt battery to charge your phone.Ī 9-volt battery can give your phone just enough life to be used for a single call or a few texts.
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