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The first thing you should do is check that your charger is in fact charging and not over/under charging.
The simple test is to check the voltage at the plug you plug into your unit, it should be 12v DC. Use a length of paper clip in the central hole of the plug - get a thin one - this will be the + (positive) terminal, the outer metal of the plug is the - (negative) terminal. connect a volt meter between those two terminals with the charger powered on and you should get 12v +- 0.5v - anything else and the charger is faulty.
If you have a faulty charger there are a number of threads here that give information about getting a replacement.
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