You need to do more than just install the cabs, assuming that's all you did. Lumos needs to be configured properly in order for it to help with any sort of battery savings. So, simply installing it is probably not helping out. Click on the link ot the thread in my sig and there is a bit more information to help you get it set up. You need to set good values for "max" and "min" brightness in different lighting environments and then you'll see a major change with battery.

Another thing to look into is changing your radio. Your device will use a ton of resources trying to lock in on a tower signal, so if your radio isn't giving you good coverage in your area, then you're going to experience battery drain that others might not. So if you're not getting solid signals, if you roam often, or find the back of teh device heats up a lot, then try changing the radio. ...links are also in my thread.

There are no magic cabs that will improve battery life, but there are settings that have an impact and you need to experiement a bit to get it right for you.

Hope that helps.