I found my battery was bone dry two weeks ago and put water in it. The car started and ran fine for two weeks then it won't start again. When I opened the battery, it is dried up again. Does that mean the battery is done and time for a new one. It is only 4 years old. The battery is from my '98 ML. The one in my SL lasted 6 years.

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95 R129
04 Infiniti G35.5 BS
10 X204