you poor soul, it sounds like, i hope this it right, you did one of two things, you were in your homes screen and accidentally pressed the minus button on the widget and dont know how to get it back, or you hid it from your available widgets (maybe, somehow?), the first one, where you pressed the minus, you can hold your finger down on an app or something on your home screen and get everything to wiggle, then you'll, hopefully, notice there is a plus sign in the VERY top left of your screen, press it and you can chose from the widgets you can use, then from there you can tap on the battery widget and select what form you like, if applicable, and just add it from there, and for the second one, if you hid it from the list of available widgets, from what i just saw when i checked my phone, there is no way to hide widgets but in case its not showing up in the screen i led you to in the first part of this, then try searching battery or something in the search bar at the top of the widget selection screen, i hope this helps and i hope this can fix your problem if you didnt fix it already