Not sure if they are suppose to last longer... If you drive your car everyday or every couple days I am sure they would be fine. If you let your car sit for a bit though you would probably need the maintainer.
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My new braille battery has died again, checked it with only 6 volts.
I need to get a battery maintainer since I only drive the FX once a week. Plus the mac mini and the alarm probably drained it even more...
This might sound strange but go to a motorcycle dealer to get a battery maintainer they all sell them. Also you might have to check to see if you have a parasitic load causing the battery to drain.