Hello lisalouise25
Welcome to BlackBerry Support Community Forums
As you said you already replaced your Battery twice and not running too much application on your device then please run your device on Safe Mode for atleast 3 hrs and see what are the results.It will let you know if the problem is because of any installed applications or if any other issues.So try it and let us know.
Also On your Homescreen go to Options - Device - Application Management - then move your trackpad right or left it will allow you to see which application is using your device resorces ,or you can activate BlackBerry Device analyser and run Battery test and see for yourself the results.
Look at this helpful Article of Knowledge Base it might also help you :
KB14320 How to maximize battery life and free memory on the BlackBerry smartphone
Prince
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