Extend the life of my batteries

If you want solution for the problem that your battery is not being charged above 80%, then here's a solution.
Samsung Laptops have a feature to extend the battery life by stoping your battery charging after 80%. If you want a full charge, check the following two steps:-
1. Disable the Samsung Software "Battery Life Extender"
2. Enter the BIOS by keep pressing F2 button just after turning on your system. In BIOS, you will find an option Battery Life Extender(or something), disable it.

after following these steps you are done.

As you want to know more about how to extend dell Inspiron 1525 battery life, you'd better to know more about Bad Habits of Using Laptop Batteries first

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Store it full charge. If you store it low charge, then battery life will be compromised. Research and tests have proven that storing batteries full charged will extend its life. Also make sure that you charge stored batteries every 3 months to further extend its life.

try checking your power saving options, you can drop down the backlight a little lower to extend battery life. Also you can lower down the volume of the system sound and check if the bluetooth is on, then turn it off. Recharge it and then check if the battery life extends. You also need to occasionally soft-reset the n30