Keeping your batteries clean and maintained is a great idea as it will help prolong the life of them. Cracks and leaks are more visible if you keep your battery clean but just make sure you wear some protection on your hands like acid resistant gloves and goggles.
Below are some quick steps for battery maintenances:
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Finding problems with the battery
Start by visually inspecting the batter to make sure there are no cracks, dirt or corrosion on the terminals. Batteries with external damage can not be used anymore and must be disposed of and recycled.
Next check the cables and connectors. Make sure they are clean, have not frayed and have their insulation intact. Make sure you tighen them to manufacturer standards.