Nothing lives forever -- and that includes your phone battery. Not only is it dying small deaths on an almost daily basis, but it's also dying a longer, slower death that'll eventually render your phone unusable if it's not permanently attached to a power source.

Unless, of course, you swap out your old battery for a new one.

You may have a sense that your battery is degrading over time, but not know at what point to replace it. A new app from online community, advocacy group and parts retailer iFixit is here to help . The app includes a battery health predictor that shows where your battery is in its lifecycle and estimates when it's time to break out the toolkit and give your device a new lease on life.

Repairing our tech rather than simply replacing it when it breaks can save u

See Full Page