First thing to check is your alternator, a quick and easy way to check is to pull the positive battery cable off the battery when the car is running, if the car dies or sounds like it wants to die then most likely your alternator is bad, but if it doesn't die and you don't notice a change in the way the engine runs then maybe your regulator is going out, that would make it charge sometimes and not others. If you don't think it is either one then it could be a short in the wiring, which would cause your car to draw too many amps thus killing your battery on long trips. I am no expert but
How's your battery, is the car starting properly. Maybe the battery or alternator.
charge the battery
the battery is low,need to be charge
Pressing the button on an iBook's battery will illuminate a string of lights; the number of lights illuminated indicates how much charge is left in the battery.
Weak battery? not holding a sufficient charge Alternator not charging battery sufficiently?
Take the negative battery terminal off for 15 minutes.
Alternator straining to maintain battery charge?
The most common cause for your 1997 Honda Civic lights to dim is a bad alternator. The alternator is not charging the battery. The battery retains a small charge, but not enough charge to run the engine.
Defective battery or something is pulling power from the battery. Check the glove box light, interior lights, trunk light, hood light, brake lights, etc.
No you sometimes need to charge your battery or get a boost if you battery runs low. Leaving your lights on for instance will totally drain the battery.
Have you tested the battery to see if it has power in it? If it has have you made sure the contacts are good? If they are is there a fuse that has blown.
This could indicate a low state of charge for the battery.