Need to replace the battery on your Samsung Galaxy S4? Maybe you like to have a spare one around so you can toss it into a bag for an extended night on the town. Whatever the case, you can scoop one up from Amazon for as little as $10.48 today. Discounted 79% off the normal price, it’s one heck of a bargain. Note that this is the real deal from Samsung and not an off-brand replacement.