Does your iPhone seem to make it through the day with a single charge? It may be time to replace your battery. Previously, the only way to get a numerical value on battery health involved “jailbreaking” your phone, which we don’t suggest. Coconut Battery, which is a fine piece of software for macs (no Windows at this time), previously would only let you know battery status of your laptop. Now, you can plug in your iPhone and see how your battery is doing. Give them a shot here.