Exactly how do you ensure you can get as much life as feasible out of your batteries? The only time you really need to worry about voltage when it pertains to charging your iPhone is when you're taking a trip to a various country. The US utilizes a totally various system than Europe, so you'll need to get a voltage converter if you want to utilize your American gadgets throughout the pond. You might have discovered that every one of your battery chargers have a block of small text on them, and also you've probably never ever bothered reviewing it.